if引导的条件状语从句
初中英语——If引导的条件状语从句
初中英语――if引导的条件状语从句在主从复合句中修饰主句中的动词、形容词、副词等的从句叫做状语从句，状语从句一般可分为时间状语从句、地点状语从句、原因状语从句、目的状语从句、结果状语从句、条件状语从句、让步状语从句、比较状语从句和方式状语从句九种。
在句子中做条件状语的从句称为条件状语从句。
可置于句首、句尾，有时还可置于主语和谓语之间。
引导条件状语从句的连接词有：if ,unless,as/so long as等1.if引导的条件状语从句表示在某种条件下某事很可能发生。
If we pay much attention to the earth, we'll have a better world.如果我们多关爱地球，就会拥有一个更美好的世界If it rains tomorrow, what shall we do? 如果明天下雨，我们怎么办？注意：if还可以引导虚拟条件句，表示不可实现的条件，从句中多用一般过去时或过去完成时。
What would happen if there were no water ? 如果没有水会怎样？2.unless引导的条件状语从句unless的意思是如果不，除非。
可与if...not互换。
You will fail in English unless you work hard. 你英语考试会不及格的，除非你更加努力。
3.as /so long as引导的条件状语从句as /so long as意思是“只要”So long as you're happy,i will be happy. 只要你高兴，我就高兴。
4.once引导的条件状语从句once引导的条件状语从句，意为“一旦...，就”，从句可置于主句前或后Once you begin,never stop. 一旦开始，就绝不要停止Maths is easy to learn once you understand the rules. 一旦你理解了规则，数学就不难学了。
If引导的条件状语从句
→主句谓语中也可以用had better(not)do,提建议 例句：如果你想减肥，你最好锻炼。
eg:If you want to lose weight,you had better take some
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exercise.
if的反义词：if...not...=unless,意思是：“如果不，除非”
W--i-t-h--y--o-u--r--h--e-l-p-, I’ll finish my job soon. 如果你帮我，我将很快完成我的工作。 If there is no water, fish may die.
Fish may die w--i-th--o--u-t--w--a--t-e-r--. 如果没有水，鱼可能会死。
I won’t go there unless பைடு நூலகம் hear from you.(同义句 if ) don’t
I won’t go there _____ I _____hear from you. I won’t go to the party if I am not invited. (同义句)
I will go out tomorrow if it doesn’t rain. = If it doesn’t rain, I will go out tomorrow.
If 引导的宾语从句放在主句之后；而if引 导的状语从句可放在主句之前也可放在主 句之后
If 引导的条件状语从句放于句首时多用逗号隔开；
时态：
if引导的条件状语从句， 主句用一般将来时（will）,从句用一般现在时。
→主句谓语中也可以含有情态动词， 如：must,can,could,should等
If引导的条件状语从句
If引导的条件状语从句在复合句中，由从句表示的状语叫做状语从句。
从句由连接词if或unless=(if not)引导的状语从句叫做条件状语从句。
条件状语从句最常用的连词是if（if是从属连词，译成：如果，假如，倘若）,由if引导的条件状语从句表示在某种条件下某事很可能发生。
例句：If people obey the traffic rules, ➜从句there will be fewer accidents. ➜主句结构：if引导的条件状语从句，既可以放在主句之前也可以放在主句后。
（放在主句前时，要用逗号隔开。
）原句可改为：There will be fewer accidents if people obey the traffic rules.主将从现，主情从现，主祈从现，If it rains tomorrow, I will stay at home.If you are hard-working, your parents may feel happy.Study hard, if she wants to get good grades.If引导的条件状语从句和宾语从句的区分：（if的含义不同）I.填空1. I will watch TV every day. My mother will be angry.If I ________TV every day, my mother _____ _____angry.2. He will have a strange haircut. The teachers won’t agree.If he _____ a strange haircut, the teachers______ _______.II. 选择1.If it rains tomorrow, we _____ visit the museum.A. don’t do B .won’t goC .aren’t go D. didn’t go.2. Will you go to the park if it ____ fine?A. will beB. wasC. is D /3. If you __to school late, your teacher _____ angry with you.A. come; areB. come, will beC. will come; areD. will come; will be4. If you _____ hard, you will ___ successful.A. work, areB. works, isC. to work, beD. work, be5. If I ____ too much TV, my mother will _______.A .watch, angryB .watched, be angryC .watch, be angryD .will watch, be angryⅢ.翻译句子:1.如果你起床晚了, 你就会上学迟到。
If引导的条件状语从句
--We’ll go to the library tomorrow if it __D_.
A. isn’t rain B. rain C. won’t rain D.will you do if you _____Ato the old folk’s
home visit?
2． I ____ her the answer if she ____me. A.can Dtell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks
3. – What are you going to do tomorrow?
If 引导条件状语从句的时态为一般现在时
记住“主将从现”
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----Sam, do you know if Alice ____to my party next week?
----I think she will come if she ____ free.
A comes; is B will come; will be C will come; is D comes; will be
If 引导的宾语从句放在主句之后；而if引 导的状语从句可放在主句之前也可放在主 句之后
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1. Can you tell me if she can come to the meeting ?
2. She will not go there if it is rainy tomorrow.
3. I can’t guess if she will be angry . 4. If we help each other , we both will get
if引导的条件状语从句
if引导的条件状语从句if条件句：条件句用于陈述语气，表示假设的情况可能发生，其中if 是“如果”的意思。
用法例句①主句为一般将来时态，if从句用一般现在时态（即主将从现）。
We will stay at home if it rains tomorrow.如果明天下雨，我将要呆在家。
②主句中含有情态动词，if从句用一般现在时态。
If you finish your homework, you can go home now. 如果你做完了作业，你现在可以回家了。
③主句为祈使句，if从句用一般现在时态。
Don’t jump into the river if you feel very hot. 如果你感到很热，不要跳入河里。
④主句为过去将来时，if从句用一般过去时态（如果涉及到be动词，一律都用were）。
此时，表达的是和现实相反的推测，用虚拟语气。
If I were you, I wouldn’t do it like that.如果我是你，我就不会那么做的。
If you gave me some money, I would be very happy. 如果你给我一些钱，我就会很高兴的。
构成条件从句主句时态If＋一般现在时主语＋shall/will+动词原形例句If he comes, he will take us to the zoo.1) 用法：(1)条件状语从句通常由连词if引导，意为“如果、假如”，主句不能用be going to表示将来，而应该用shall，will。
If you leave now, you are never going to regret it. (错误)If you leave now, you will never regret it. (正确)(2)if “如果”，引导条件状语从句，主句用一般将来时，从句则用一般现在时，如：If it rains tomorrow, I shan’t climb the hills.(3)另外，主句是祈使句或含有情态动词，从句也用一般现在时。
if 引导条件状语从句
if 引导条件状语从句【最新版】目录1.条件状语从句的定义和作用2.if 引导条件状语从句的用法3.实例分析4.注意事项正文一、条件状语从句的定义和作用条件状语从句是表示某种条件成立时，主句所表达的内容才会实现的从句。
它通常由连词 if 引导，用来表示在某种条件下，主句所述情况是否成立。
条件状语从句在英语中十分常见，具有很强的实用性。
二、if 引导条件状语从句的用法if 引导条件状语从句时，主句通常使用一般将来时，而从句则使用一般现在时。
这种时态搭配是为了表示在某种条件下，将来会发生的事情。
当然，在某些特殊情况下，也可以使用其他时态，例如主句使用一般现在时，从句使用一般将来时。
三、实例分析1.如果明天不下雨，我们会去公园。
（If it doesn"t rain tomorrow, we will go to the park.）在这个例子中，从句“it doesn"t rain tomorrow”表示一种条件，即明天不下雨，主句“we will go to the park”表示在这种条件下会发生的事情，即我们去公园。
2.如果你愿意，我们可以一起去看电影。
（If you are willing, we cango to the movies together.）在这个例子中，从句“you are willing”表示一种条件，即你愿意，主句“we can go to the movies together”表示在这种条件下会发生的事情，即我们一起去看电影。
四、注意事项在使用 if 引导条件状语从句时，需要注意以下几点：1.条件状语从句中的 if 通常可以翻译为“如果”，但有时也可以翻译为“是否”或“是不是”，具体翻译需要根据上下文判断。
2.条件状语从句中的时态搭配要正确，通常为主句一般将来时，从句一般现在时。
3.条件状语从句有时可以省略 if，直接用主句和从句连接，例如：It will be fine if it doesn"t rain.（如果下雨，天气就不会好了。
If引导的条件状语从句
1.If you __C___ to the party, you’ll have a great time.
A. will go B. went C. go D. going 2． I __D__ her the answer if she ____me.
A.can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks
11. If you ___a_re_____(be) happy , we will be happy .
12. If she translates (translate ) the sentence word by word , she __w_il_l _g_e_t_(get ) its true meaning .
2 If I ___c_o_p_y____(copy ) your homework , I will cheat myself .
3 If she ___d_o_e_s_n_’t_g_e_t____(not get ) up early , she’ll miss the early bus .
4 If your mother___b_u_ys__ (buy) the book for you , it will be good for your study.
• 例如： If you have any questions to ask, please come to my office. 如果你有问题要问的 话，请到我办公室来。
1. if 在句中的含义不同 I want to know if he is a teacher.
If-引导的条件状语从句
If 引导的条件状语从句If 引导的条件状语从句遵循主过从过、主将从现的原则。
主将从现（主情从现、主祈从现）If it rains tomorrow,I won’t climb the hills.If it doesn’t rain tomorrow,I will go to the countryside with my friends.If 引导的条件状语从句If 引导的条件状语从句遵循主过从过、主将从现的原则。
主将从现（主情从现、主祈从现）If you will help me,I'll finish it on time.We may go out if it's fine tomorrow.If you finish your homework,you can watch TV.Please call me if you go shopping next Sunday.If I go there，I'll take her some flowers.We'll stay at home if it rains tomorrow.Please call me if he’s at home.If you work harder,you’ll pass the exam.She will visit her grandpa if she has time tomorrow.We’ll take a taxi to the city if the train doesn’t arrive on time.The teacher will be angry if he is late.If引导的条件状语从句与unless引导的条件状语从句的转换If+否定形式=unless+肯定形式You won’t pass the exam if you don’t work hard.=You won’t pass the exam unless you work hard.If you don’t go to bed earlier,you will feel tired in the morning. =Unless you go to bed earlier,you will feel tired in the morning. If it doesn’t rain,he will play with me tomorrow.=Unless it rains,he will play with me tomorrow.If she doesn’t come,I’ll go shopping alone=Unless she comes,I’ll go shopping alone.if条件状语从句与祈使句,and/or＋一般将来时的句子转化If you get up early,you’ll get there on time.=Get up early,and you’ll get there on time.=Get up early,or you won’t get there on time.If you get up early，you won't be late for school.=Get up early，and you won't be late for school.=Get up early，or you will be late for school.If you don’t get up early,you won’t catch up with the early bus. =Get up early,and you will catch up with the early bus.=Get up early,or you won’t catch up with the early bus.if条件状语从句与without的句子转化If there is no water,we can't live.=We can't live without water.If there is no water,fish will die.=Fish will die without water.If you help me,I’l l finish the work soon.=With your help,I finish the work soon.if条件状语从句与祈使句,and/or＋一般将来时的句子转化If you get up early,you’ll get there on time.=Get up early,and you’ll get there on time.=Get up early,or you won’t get there on time.If you get up early，you won't be late for school.=Get up early，and you won't be late for school.=Get up early，or you will be late for school.If you don’t get up early,you won’t catch up with the early bus.=Get up early,and you will catch up with the early bus.=Get up early,or you won’t catch up with the early bus.1. your friend ,I'll tell you.eB.will comeesD.are coming2. If you go to college，you a good education.A.will getB.getC.getsD.got3.I want to know if they tomorrow.eB.will come C comes D.came4.Take enough exercise, you'll be in good heath.A.orB.soC.butD.and5.If it (not rain),he (play)basketball withme tomorrow.6.If Uncle Lan ______(come),I______(call)you up.7.She must see a dentist if she______(have)a toothache.8.Please wake me up if he______(come)back.9.Hurry up！Or you ______(be)late again.10.If you don’t be quick,you(be)late.1.We won’t wait for you you can’t arrive on time.A.untilB.whenC.afterD.if2.The children will go to the zoo if it (not rain)this Saturday.3.If she work hard,she be able to go to colleage.A.not,notB.won’t,won’tC.won’t,doesn’tD.dpesn’t,won’t4.If I run every day,I (be)healthier.5.If it (not rain),he (play)with me tomorrow.6.She must see a dentist if she (have)a toothache.7.Study hard,or you (not pass)the test.8.If you (not go)to bed earlier,you will feel tired in the morning.9.If he (be)free tomorrow,he will come to your birthday party.10.We will go to the zoo if it (not snow)tomorrow.。
If引导的条件状语从句
5. If you __d_o_n_’_t _w_o_rk___(not work ) hard , you _w_o_n_’_t _p_as_s_(not pass) the exam.
6. If she __m__e_n_d_s_(mend) the computer , her father __w_o_n_’t_b_l_am__e_(not blame ).
1.有if引导的条件状语从句的复合句中，当主句和从句的 主语均为you时，可转换为“祈使句，and+简单句”或
“祈使句，or+简单句” You can pass the exam if you work hard. Work hard ----------------，and you will pass the exam.
If you don't hurry up,you will be late again.
or Hurry up,------ you will be late again.
2. 借助介词with 或without来转换。
例如: If you help me, I’ll finish my job soon.
If引导的条件状语从句
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if引导的条件状语从句
例句：If people obey the traffic rules, →从句 there will be fewer accidents. →主句
if:从属连词，意思是：“如果，假如，倘若”
： 结构
if引导的条件状语从句既可以放在句子前， 也可以放在句子后。
时态：
if引导的条件状语从句， 主句用一般将来时（will）,从句用一般现在时。
→主句谓语中也可以含有情态动词， 如：must,can,could,should等
小学英语if 引导的条件状语从句讲解
if引导的条件状语从句（包含主将从现原则）一.if的位置：if“如果”，当引导条件状语从句时，既可以放在主句前面，也可以放在主句后面。
若if引导的条件句放在句首，从句后面要加逗号与主句隔开。
例如：My mother will take me to the park if she is free.如果我妈妈有空，她就会带我去公园。
If my mother is free, she will take me to the park.如果我妈妈有空，她将会带我去公园。
（此句if引导的条件状语从句位于句首，主句位于其后，所以要用逗号隔开）二.时态的运用注意：在if的条件状语从句中，主句为下列情形之一时，if条件状语要用一般现在时。
1.主句是一般将来时（主将从现）例如：If he comes, he will tell me all.如果他来了，他会告诉我所有（的事情）。
（这个知识点在初中阶段是常考题，简称“主将从现”——主句是一般将来时态，从句是一般现在时态。
本句中主句是由will引导的一般将来时态的句子，从句是由if引导的一般现在时态的句子，符合主将从现的法则。
）2.主句是含有情态动词may/might/can/must/should等句子。
例如：If you want to lose weight, you must eat less bread.如果你想减肥，你必须少吃面包。
（主句中含有情态动词must，所以if引导的条件状语从句要用一般现在时态。
）3.主句是祈使句例如：If you are not strong enough, please don't take part in such an activity.如果你不够强壮，请不要参加这种活动。
（主句是一个Do型的祈使句，所以根据原则，if从句要用一般现在时态。
——不清楚Do型祈使句的小伙伴可以查看冉老师历史发文记录）三．习题1.If you to be a rich man ,you should try hard.A. wantingB. wantedC. wantD.are want2. If you English, you can be an English teacher.A. likingB. likedC. likeD. are like3. If you like sports , you a PE teacher.A. areB. mustC. can beD. could。
if引导的条件状语从句讲解
条件状语从句在句子中做条件状语的从句称为条件状语从句。
通常置于句首或句尾。
一．条件状语从句通常由if（）, unless（），as long as（）引导。
例如If we pay much attention to the earth, we'll have a better world.如果我们多关爱地球，就会拥有一个更美好的世界If it rains tomorrow, what shall we do?如果明天下雨，我们怎么办？尝试一下：（补全句子）If it rains tomorrow, we won’t go to the park.______________________________________。
Unless weather stops me, I go for a walk every. 我每天都会去散步，除非遇上坏天气。
只要我们竭尽全力，父母就会满意我们的表现。
Our parents will be pleased with our performance _____ _____ ______ we try our best.二、if引导的条件状语从句（1）“if从句+祈使句”的句子。
其实，if作为一个连词，主句也可以是其他形式的句子。
例如：If you want to go, please let me know.If the green light isn’t on, wait for a minute.｝（）(2)“祈使句+ and (or)+ 陈述句” 在意思上相当于一个带有条件状语从句的复合句。
注意：A. “祈使句+ and + 陈述句”可以转化为if引导的肯定条件状语从句，而且主语是第二人称。
B. “祈使句+ or + 陈述句”可以转化为if引导的否定条件状语从句，而且主语是第二人称。
例如：Study hard and you will pass the exam. =_________________________________________.Hurry up, or you’ll be late. =__________________________________________________..考题(2010重庆中考)Work hard，________ you may catch up with your classmates soon.A.orB.butC.andD.yet黑色陷阱：本题的陷阱是句型，本句型区别于“祈使句＋or”，这个句型的含义是“……，不然的话/否则……”。
总结好的：if引导的条件状语从句
总结好的：if引导的条件状语从句if引导的条件状语从句if1) ⽤法：(1)条件状语从句通常由连词if引导，意为“如果、假如”，主句不能⽤be going to表⽰将来，⽽应该⽤shall，will。
If you leave now, you are never going to regret it. (错误)If you leave now, you will never regret it. (正确)(2)if “如果”，引导条件状语从句，主句⽤⼀般将来时，从句则⽤⼀般现在时，如：If it rains tomorrow, I shan’t climb the hills.(3)另外，主句是祈使句或含有情态动词，从句也⽤⼀般现在时。
如：Please call me if he comes next Sunday.Can you call the policeman if you are in the trouble.注意宾语从句中的if与条件状语从句if的区别。
宾语从句中的if“是否”相当于whether，引导宾语从句，时态需根据语境确定。
如果主句⽤⼀般现在时，从句可以根据具体情况选⽤时态，如果主句⽤⼀般过去时，从句必须⽤过去式的某种形式。
I don't know if it will rain tomorrow. 我不知道明天是否会下⾬。
Our teacher said there was going to be a football match the next month.我们说下⽉将有场⾜球⽐赛。
【边学边做】⽤括号内所给词的正确形式填空。
1. What will you buy if you ________（have）a lot of money?2. If it ________（not snow）tomorrow, we will feel unhappy.3. You mustn’t go to school if you ________（be）still in bed.4. If he _______（be）at home at that time, he would know it.5. Please show me the way if you ________（know）it.6. You will hurt your teeth if you ________（eat）too much candy.7. If you gave me a toy car, I _________（be）very happy.8. I would get the prize if I _________（work）hard.9．If she ______ (finish ) work early ,she ______(go) home.10．If the weather______（be）fine，we_______(go)for a walk .11. If I_____(have) time tonight ,I _______(finish) the book I’m reading.12. If it ______(rain) next weekend , we_______(not be able to ) plant the vegetable .13. If it_______(rain),we______(stay) at home .14.If she______(arrive) ,she _____(phone) me .15. If he_____(call),tell him I’ll ring back .⼆、⽤所给词的适当形式填空1. If you ________(feel) tired, you _________ (have) to have a rest.2. Where _____ he ____(see) the film if he _________(have) time?3. If there ____ (be) fewer trees, there _______ (be) more pollution.4. He ___ (dress) more casually if he ___ (not work) on weekends.5. If Marcia _______ (live) alone, she _______ (keep) a pet parrot.6. Lana _____ (buy) a new dress if the old one ____ (be) out of style.7. The twins _______ (fight) if they__________ (argue).8. I ______ (have) a bake sale if I ____ (need) money for education.9. Peter ____ (send) me a beautiful souvenir if he ____(tour) Spain.10. If Mr. Green _______ (say) I am hard- working, my parents ___ (feel) glad.11. I ______ (go) to the beach if it________ (not rain) this week.12. _____they ___ (have) a match if the P.E. teacher __ (be) busy?13. He ____ (write) a letter to his grandparents if he ____ (get) his report card this week.14. If she ______ (get) up late, she _____ (not catch) the early bus.15. Peter ____ (major) in English if he ____(pass) the exams in Peking University.⼆、完成句⼦1. 他如果看电视太久了，他的⽗母会不⾼兴。
if引导的条件状语从句
if 意思是：如果，倘若，即使。
先来看一个句子：If it rains tomorrow, we will not go to the zoo.这是一个复合句，有主句，有从句。
If后到逗号前的句子就是由if引导的条件状语从句，后面的一般将来时的句子是整个句子的主句。
在if 引导的条件状语从句中，如果从句谈论的是一个有可能发生的事实及其产生的相关的结果，主句用一般将来时态，从句用一般现在时态。
如：We will walk there if we can't find a bus.What will you do if you find a panda in danger?在if 引导的条件状语从句中，if 和条件句位置灵活，可直接放在主句后面，若if 条件句放句首，从句后面要加逗号，和主句隔开。
还要注意前后时态.现在总结一下:if 条件句不一般,几个要点记心间;条件句,放在前,逗号要放句中间。
条件句表可能，主句多用将来时；条件句表事实，主句常用现在时。
一．在正确的答案下划一条线。
1.Daina ( will go/go/goes) to Europe if she (will pass/pass/passes) the exams .3. If there (will be/ are/is) a car accident, they (will call/call/calls) 110 for help at once.4. If it (won’t/don’t/doesn’t/ isn’t) rainy, we (will take/ take/takes) walk outside.5. If a UFO (will land/land/lands) in front of me, I (will go/go/goes) in to look for the alien.6. If he (will have/have/has) money, he (will bulid/build/builds) a science lab.7. Don’t wait for me if I (am/ will be) late.8. They (won’t/don’t) go to the beach if it (will rain/rain /rains).9. I (will call/ call) you if he (will stay/stay /stays) at home.10. Mr. Smith (will let/ let/lets) you know if he (will need/ need/ needs) help.二、用所给词的适当形式填空1. If you ________(feel) tired, you _______________ (have) to have a rest.2. Where _______ he _________(see) the film if he ________________(have) time?3. If there __________(be) fewer trees, there _______________( be) more pollution.4. He _____________(dress) more casually if he ________________( not work) on weekends.5. If Marcia _____________(live) alone, she ___________________( keep) a pet parrot.三、选择（15分）1. If you _____ to the party, you’ll have a great time.A. will goB. wentC. goD. going2. It will be a long time ____ Peter _____ his work.A. since, has finishedB. after, finishesC. when, will finishD. before, finishes.3. What will father _____ us from Japan?A. takeB. bringC. carryD. make4. Weifang is famous ______ kites.A. forB. toC. onD. with5．I ____ her the answer if she ____me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, asks6. – What are you going to do tomorrow?--We’ll go to the library tomorrow if it ___.A. isn’t rainB. rainC. won’t rainD. doesn’t rain7.—Do you know when he will come back tomorrow?--Sorry, I don’t know. When he ____ back, I’ll tell you.A. comesB. will comeC. comeD. may come8. What will you do if you _____ to the old folk’s home visit?A. goB. wentC.goingD. will go9. If I eat ____ food, I’ll be very fat.A. too manyB. many tooC. too muchD. much too10. I’ll give the book to him if he ___ here next Sunday.A. will comeB. comesC. is comingD. came11. There ____an English film in our school tomorrow.A. is going to haveB. will haveC. is going to beD. has12. Could you tell us where ____？A. will the next Olympic Games heldB. the next Olympic Games will be heldC. would the next Olympic Games be heldD. the next Olympic Games would be held13. When my mother returned last night, I ____ a book.A. readB. am readingC. was readingD. am going to read14.What ____ you ____ when it began to rain?A. do, doB. were, doingC. are, doingD. did, do15. I’ll wake you up when he ____back.A. willB. is going to comeC. comesD. come。
if引导的条件状语从句的用法
（3）假设
真的，或者有可能成为真的；
（二）假设将来，假设的条
将来
件是将来可能实现的。
1. if 非真实条件句（虚拟）——假设现在
（二）遵循的原则
should do
might+do
例 7 If I _____(be) a bird,I would fly to you right
状态，是正在玩球的意思，
所以此空填 is playing。
3. if 引导的真实条件状语从句——假设将来
例 3 If it _____(rain) tomorrow,we will stay at home.
解析：如果你不想受伤，
就不要玩刀。根据 Don’
t
play with the knife,主句是祈使句，所以从句为 if 引导
to the park.
he will take me to the park,主句用的一般将来时，而且
可以分析出，他哥哥现在还没有回，所以从句为 if 引
导的表将来的条件状语从句。根据“主将从现”的原
则，此空填 comes。
2. if 非真实条件句（虚拟）——假设过去
例8
Years ago if someone_____ (turn) round to
批改学生作文时，遇到拼写错误较多的学生可以这样
及各个时代相关代表作品的赏析，感受中西方文化的
评价：
不同，提高其审美水平；在进行人教版（2014）高中英
neat and tidy！
学生参观学校的科学实验室或者本地的科技馆，感受
1. 认 同 欣 赏:I like your handwriting，which is so
初中英语If引导的条件状语从句
初中英语――if引导的条件状语从句在if 引导的条件状语从句中,if 和条件句位置灵活,可直接放在主句后面,若if 条件句放句首, 从句后面要加逗号,和主句隔开;还要注意前后时态一致原则.引导条件状语从句的连接词主要有：if如果、unless除非或as long as只要等;unless在意思上等于if...not;一、条件状语从句用法1、引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生;如：If you ask him, he will help you.如果你请他帮忙,他会帮你的;If you fail in the exam, you will let him down.如果你不及格,你会让他失望的;另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时;如:If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会;2、unless = if...not.除非,若不,除非在……的时候例如：Let's go out for a walk unless you are too tired.=If you are not too tired, let's go out for a walk.Unless it rains, the game will be played.除非下雨,比赛将照常进行;二、时态问题在条件状语从句中,要注意“主将从现”的规定,即主句用一般将来时,从句用一般现在时表示将来时;例句：I will come to see you if I have time.我有时间,我就来看你;三如果if 条件句谈论的是重复发生和预示要发生的情景和事件,则主从句大多用一般现在时态;如：If bears are in danger ,they attack people.误区提醒if 既可以引导条件状语从句,表示“如果”,也可以引导宾语从句,表达“是否”;辨别它在这两种从句中的时态是我们经常容易出错的地方;另外,if 和unless的用法也需注意;典型例题：----I wonder if your wife to the party.----If your wife _________, so will mine;.A. will go, goB. will go, goes, will go D. will go, will go解析：第一句中if表示“是否”,引导宾语从句,用将来时will go；第二句“如果你的妻子去,我的妻子也去”,if引导条件状语从句,用一般现在时表示将来时; your wife,单三人称主语,所以用goes ;总结IF引导的一、表示将来可能发生的：1 If sb does sth, sb will do sth= sb will do sth if sb does sth主句一般将来时从句一般现在时2主句为祈使句或情态动词形式If sb does sth, please do sthIf sb does sth, sb may情态动词do sth二、表必然发生的If sb does sth, sb/sth does sth= sb/sth do sth if sb does sth主句一般现在时, 从句一般现在时相当于when引导的从句Unless引导的sb will do sth unless sb does sthif sb does not do sth练习______ fail in the exam if he ______ not study hard.you ______ leave now, you ______be late.______ have a barbecue unless it ______ rain .up, or you will miss the bus.同义句转换___ you don’t hurry up, you ____ catch the early bus.hard, or you’ll miss fall behind.同义句转换______ you study hard, you______ fall behind.you don’t put on your scarf, you’ll catch cold.同义句转换Put on your scarf, _____ you’ll catch cold.don’t know i f it_______ tomorrow. 表是否,用将来时态If it ____ ,I won’t go shopping. rain表如果,用现在时态want to know if he _________come tomorrow, if he _______come, I __________give the massage to him.9. Please let us know if he ________arrive tomorrow.请告诉我们他明天是否会来Please let us know if he _________ arrive tomorrow.如果他明天来的话请告诉我们’m sure if he _____go to the party, he________ have a great time.the rain _______stop tonight, we will go to the cinema.’ll buy a computer if I ______have enough money._________not get nervous if you _____do enough exercise.she ____ be kind to me , I __________not argue with her.you _____pay more attention to that, he _________ not get injured. Li will be mad if we _______break the rules.17. If it _____ be cloudy, they _______not go there by air.I say “Hello” when the foreigner ______come into the classroom’ll get better grades if he _________ study hard.20. If you work really hard, you _______ be famous and rich.if 条件状语从句的时态练习一．在正确的答案下划一条线;will go/go/goes to Europe if she will pass/pass/passes the exams .2. The graduates will teach/teach/teaches in the poor village if the Ministry of Education will agree/ agree/agrees soon.3. If a UFO will land/land/lands in front of me, I will go/go/goes in to look for the alien.4. If he will have/have/has money, he will bulid/build/builds a science lab.’t wait for me if I am/ will be late.won’t/don’t go to the beach if it will rain/rain /rains.7. I will call/ call you if he will stay/stay /stays at home.8. Will / Do/ Does he visit the museum if he won’t / don’t/ doesn’t get tired9. Where will/ do/does they live if they will miss/ miss/ misses the bus二、用所给词的适当形式填空you ________feel tired, you _______________ have to have a rest.3. If there __________be fewer trees, there _______________ be more pollution.5. If Marcia _____________live alone, she ___________________ keep a pet parrot.6. Lana ________________ buy a new dress if the old one ____________be out of style.twins ______________fight if they_______________argue.8. I ____________have a bake sale if I _____________need money for education.9. Peter _____________ send me a beautiful souvenir if he ________________tour Spain.10. If Mr Green ___________say I am hard- working, my parents _________ feel glad.____________go to the beach if it________________ not rain this week.12. __________they __________ have a match if the . teacher _____________be busy____write a letter to his grandparents if he ____get his report card this week.14. If she ____________get up late, she _____________ not catch the early bus.15. Peter ________major in English if he ____pass the exams in Peking University. Ⅰ.单项选择15分you _____ to the party, you’ll have a great time. A. will go B. went C. go D. going2. It will be a long time ____ Peter _____ his work.A. since, has finishedB. after, finishesC. when, will finishD. before, finishes.3. What will father _____ us from Japan A. take B. bring C. carry D. make4. Weifang is famous ______ kites. A. for B. to C. on D. with5．I ____ her the answer if she ____me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, asks6. – What are you going to do tomorrow--We’ll go to the library tomorrow if it ___.A. isn’t rainB. rainC. won’t rainD. doesn’t rain7.—Do you know when he will come back tomorrow--Sorry, I don’t know. When he ____ back, I’ll tell you.A. comesB. will comeC. comeD. may come8. What will you do if you _____ to the old f olk’s home visitA. goB. went D. will go9. If I eat ____ food, I’ll be very fat.A. too manyB. many tooC. too muchD. much too10. I’ll give the book to him if he ___ here next Sunday.A. will comeB. comesC. is comingD. came1---5 CDBAD 6---10 DAACB 11---15。
if 引导的条件状语从句
一、if 引导的条件状语从句，主句用一般将来时，从句一般现在时。
即“主将从现”连词if的意思是“如果”，它引导的句子表示某事发生所需要的条件，即“在……条件下某事才能发生”，在句子中充当状语，因此我们称之为条件状语从句。
在复合句中连词if引导的句子为从句，被修饰的句子为主句。
从句可以放在主句后，也可以放在主句前，从句放在主句前时，应用逗号将它与主句隔开if_______If you study hard, you will get good grades.I _won’t_ play basketball this afternoon if it_ __rains___.I ___will_ play basketball this afternoon if it __doesn’t_ _rain.练一练1. If you _____ to the party, you’ll have a great time.A. will goB. wentC. goD. going2. – What are you going to do tomorrow? --We’ll go to the library tomorrow if it ___.A. isn’t rainB. rainC. won’t rainD. doesn’t rain3. I’ll give the book to him if he ___ here next Sunday.A. will comeB. comesC. is comingD. came4. There _________a basketball match in our school tomorrow afternoon, if it doesn’t rain.A. will be B will have C have D is用go与rain的正确形式We_______ to the Great Wall if it ____________ tomorrow.If it ______________ tomorrow, we___________to the Great Wall.二、as soon as的用法“一···就···”的意思主句用一般将来时，从句一般现在时。
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语法10单元语法再现梁老师组稿2017-12-31
一、观察下面的句子
If you go to the party, you will have a great time.
If you do , you will be late.
If you do,you will be sorry.
If they have it today, half the class won’t come.
If we ask people to bring food, they will just bring potato chips and chocolate.
以上几个句子中“if”有相同的含义“如果”，引导条件状语从句逗号后面的句子是主句。
整个连起来的大句子叫主从复合句。
注意主句和从句的时态有什么特点。
总结：If引导的条件状语从句用一般现在时，主句用一般将来时。
简称“主将从现”
练习：（1）If you ______(come)here, you ___________(be) happy.
(2) If it _________(rain) tomorrow, we__________(not, go) to the park.
(3) If he _________(come) here, I ___________(call) you.
(4) If it ___________(not rain), we _________(have) a picnic(野餐).
(5) If we do that, more people _________(want) to play the games.
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(6) If they _______ that , the games _______(be) more exciting, too.
(7)What ______ happen if they_______ (have) the party today?
(8) What ______ happen if they _______ a video at the party?
(9) If he ______(take) a taxi, it _______(be) too expensive.
(10) If I _______(go) to the movies, I ____________(finish) my homework.条件状语从句的引导词还有“unless 除非（否则），如果不”
You won’t pass the exam unless you study hard.
Unless you deal with(处理）your problems, you will be unhappy.
二、同样when可以引导状语从句“主将从现”也适合
也就是说：when引导的时间状语从句也是一般现在时，
主句也是一般将来时。
What are you going to be when you grow up?
What is he going to be when he grows up?
三、“主将从现”的含义扩充
主：表示主句
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将：（1）主句是一般将来时
（2）主句是祈使句
（3）主句含有情态动词can、may、must/have to
从：表示状语从句
现：表示状语从句是一般现在时
例句：
(1)Don't go and play football if your homework ______________(not finish) .
(2)If it ____________(not rain) tomorrow, we ______________(go)to climb the hill.
(3)He wo n't leave until you _______________(agree)with him.
(4) You can cross the road when the lights _________(turn) green.
(5)I _____________(call)you as soon as he ____________(tell) me about the good news.
(6)The students will go to Summer Palace if it __________ tomorrow.
A. don't rain
B.won't rain
C. doesn't rain
D. isn't rain
四、if 翻译成“是否”，引导宾语从句，时态是：一般将来时。
例如：I don’t know if he will come tomorrow.
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V.
He asks me if I will be free .
V.
They want to know if they will have a party next week.
V.
注意把if的两个意思放在一道题中考试。
（主将从现宾将）Mary wants to know if Tom will come. If he comes, I will call Mary.
练习：
1.I don't know if it _____ tomorrow. If it ____ , we'll go out for a picnic.
A. will rain; doesn't rain
B. will rain; rains
C. rains ; will rain
2.---Does Ted tell you if he ___next Sunday?
---No, he doesn't. But if he ___. I'll give you a ring.
A. will come; will come
B. comes; will come
C. comes ; comes
D. will come; comes
3. ---I wonder if it ____tomorrow.
---Don't worry. If it ____, we'll stay at home.
A.rains; rains
B. will rain; rains
C. rains; will rain
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五、含有时间状语从句的主从复合句，常考时态有两种可能：
常考的引导词when 、as soon as(一------就------）、
not--- until--（直到------才---）
主句从句
1、主将从现
（1）He is going to be an engineer when he grows up.
主句：一般将来时when 引导的时间状语从句一般现在时（2）I will call you as soon as he comes here.
主句：一般将来时as soon as引导的时间状语从句一般现在时(3)I wo n’t go to bed
主句：一般将来时until引导的时间状语从句一般现在时
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2、第二种情况：主句和时间状语从句都是一般过去时态（要过去都过去）
I didn't go to work until I finished my homework.
我直到完成了作业才上床睡觉。
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