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一、If引导的条件状语从句的结构If+主语+谓语+其它,主语+谓语+其它.=主语+谓语+其它+if+主语+谓语+其它.注：①有if 的是从句,另一个是主句② if 从句在前有逗号，if从句在后无逗号eg.If he runs, he will arrive there in time .=He will arrive there in time if he runs .如果他跑，她将会准时到达.二、if条件句主句和从句的时态，if译为如果1.主句用一般将来时（will+ V-原），if 从句用一般现在时（be用is/am /are ,实义动词用V-原/V-三单）, 即主将从现注：①当主语为I ,you, we, they ,复数名词，以及由and连接的两个并列成分等时，实义动词用V-原②当主语为he ,she ,it ,that ,单个人名，单数名词等时，用V-三单）eg .If it is (be) rainy , we will stay(stay) at home .If she studies (study ) hard , she will get (get) good grades .2.若主句中含有情态动词(can/may/ must/may/might/should )时，主句为情态动词+ V-原，if从句用一般现在时eg .We can will go(go) out if it stops (stop ) raining .eg.If you want (want) to get good grades ,you should study (study)hard.3.若主句为肯定祈使句或否定祈使句时，if从句用一般现在时注：以V-原开头的句子是肯定祈使句，否定祈使句在V-原前加Don’teg. Eat (eat) them if you are (be) hungry .eg. Don’t go (not go)to play football if she doesn’t finish (not finish)your homework .拓展:if 还可引导宾语从句，译为“是否”If 引导宾语从句时，时态需根据语境确定，如果主句是一般现在时，从句可以根据具体情况选用时态，如果主句是一般过去时，从句必须跟过去时相关( )1.----Mike wants to know if _________ a picnic tomorrow .----- Yes . But if it _________ , We will visit the museum .A. will you have , will rainB. you will have , will rainC. you will have ,rainsD. will you have , rain( )2.We are not sure if it ____ tomorrow .If it ____ , our sports meeting will be put off .A. will rain , rainsB. rains , will rainC. will rain ; will rain ( )3. ---Can you guess if Mike _______ swimming this afternoon ?---I think he will go with us if he _______ fine .A. will go ,isB. will go ,will beC. goes , isD. goes ,will be答案解析：1.迈克想知道是否你们明天将去野营，if译为是否，引导宾语从句，时态根据语境而定，句末有tomorrow , 所以要用将来时。
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
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引导的条件状语从句知识讲解
2. 借助介词with 或without来转换。
例如: If you help me, I’ll finish my job soon.
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.
• 2. 在if引导的条件状语从句中不能够使用some， 而要用any。
• 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.
3 If she ___d_o_e_s_n_’t_g_e_t____(not get ) up early , she’ll miss the early bus .
3. 时态要求上有区别
1.I want to know if there will be
a
sports meeting next month.
If 引导的宾语从句的时态由主句及本身时
态决定；
2.If it doesn’t rain , we’ll hold it.
If 引导条件状语从句的时态为一般现在时 记住“主将从现”
I won’t go there _____ I _____hear from you. I won’t go to the party if I am not invited. (同义句)
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
潘店镇中学
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
If引导的条件状语从句
If引导的条件状语从句很多英语学习者都觉得If引导的条件状语从句这个句型很难，学习起来很吃力。
下面是店铺为你整理的If引导的条件状语从句的相关资料，希望大家喜欢!If引导的条件状语从句用法1.if引导的条件状语从句可以放在主句之前，也可以放在主句之后，如果放在主句之前，中间要用逗号将主句和从句隔开。
例如：If I am free, I will come to see you.= I will come to see you if I am free.如果我有空，我就来看你。
2. 在含if引导的条件状语从句的复合句中，主句用一般将来时，从句通常用一般现在时态表示将来意义，即“主将从现”原则。
例如：If it snows tomorrow, we will go skiing.如果明天下雪，我们就去滑雪。
3. 在含if引导的条件状语从句的复合句中，语句的谓语还可含有情态动词can、must、may等，主句也可是祈使句。
例如：If it stops raining, we can go out.如果雨停了，我们就能出去。
4. 在含if引导的条件状语从句的复合句中，如果主句部分描述的是客观事实或真理，要用一般现在时。
例如：If you heat the ice, it turns into water.如果你加热冰，它就会变成水。
if引导的非真实条件句对过去的虚拟条件从句(if):主语+had done 主句might/would/should/could+have done对现在的虚拟if+ 主语+动词过去式(be用were)主句might/would/should/could+do对将来的虚拟if+主语+动词过去式(be用were)或主语+should do或主语+were to do主句 might/would/should/could+doe.g.Tom got to the station in time because he started earlier.If Tom had started late, he would have missed the train.Do you think the thief entered through the door?No, if he had, I don't believe, he would have broken the living room window.If the book weren't so expensive, I would buy it.If you didn't live so far away, we would be able to visit you more.What would you do if you lost your passport in a foreign country?Why hasn't he come? If he should not come on time, we would have to put off the trip.2.注意事项e.g.If she hadn't work hard at English in the past, she wouldn't work as well as a secretary in a large company now. 混合时间的虚拟语气从句为对过去的虚拟，主句是现在。
if引导的条件状语从句
◆if引导的条件状语从句条件状语从句是在复合句中作条件状语的句子。
表示假如有从句的动作发生就会有主句的动作发生。
条件状语从句常由从属连词if 引导。
◆if引导的条件状语从句使用须知：一、位臵if引导的条件状语从句，既可放在主句之前也可放在主句之后。
当从句臵于主句之前时，常用逗号与主句隔开。
例如：You will catch the bus if you get up early.=If you get up early, you will ca tch the bus.如果你早起的话，就能赶上公共汽车。
二、时态应遵循主、从句时态呼应的原则。
当主句是一般现在时 (包含祈使句和含情态动词ca n, may, must等的句子)，从句也用一般现在时。
例如：You must see the doctor if you ar e ill.如果你生病了，你必须去看医生。
If you want to go skating, wear w armclothes.如果你想去滑冰，穿上暖和点的衣服。
一．选择正确答案。
1. It was raining heavily___we got to Paris.A. whileB. ifC. when D. because2. I don’t know if ___tomorrow.A. it doesn’t rainB. the rain will stopsC. the rains won’t stopD. it won’t rain3 . The volleyball match will be put off if it___.A. will rainB. rainsC. rai nedD. is raining4. Difficulties are nothing if we ___no t afraid of themA. willB. shallC. areD. do5. We ___Beijing tomorrow if it doesn’t rain.真的不掉线吗？？、？？？？？？？？？？？？A. are going toB. wouldC. shal lD. will go6. I don’t like to be interrupted if I__ _.A. speakB. will speakC. am speaki ngD. spoke7. If you ___the book you will understa nd the story better.A. will be readingB. have readC. will have readD. read8. If you ___I will go with youA. go toB. wentC. willD. s hould go9. I’ll go to meet you，if I ___free the n.A. would beB. will beC. amD. was10. If you ___to the music, buy a CD.A. will listenB. listenC. li steningD. listened11. He suggested ___ a pinic tomorrow.A. to haveB. havingC. haveD. to having12. Be careful, if you ___want to make mistakes.A. won’tB. don’tC. didn’tD. not13. Work hard if you ___to get a good mark.A.wantedB. wantingC. wantD. will want14. I want to know if you___to the part y tomorrow.I will if I___free.A. will e; amB. e; amC. will e; will beD. e; will b e15. The cat ___him___the hand.A.bit; inB. bited; onC. bit; onD. bited; on16. There is going to ___ a sports meeting next week. If it___ , we’ll have to cancel it..A. be; will rainB. have; w ill rainC. be; rainsD. give; is g oing to rain真的不掉线吗？？、？？？？？？？？？？？？17. If he ___, I ___go swimming al one.A. doesn’t e will goB. won’t e; will goC. will e; won’t goD. is ing; d on’t go18. If you ___ a chance to study ina foreign country, just take it.A. gettingB. had gotC. will getD. get19. Frank ___ a film if he’s free ne xt Saturday.A. seeB. sawC. has seen D. will see20. If he ______ exercise, he ___h ealthy.A.not; willB.isn’t; won’t beC.doesn’t; will beD.doesn’t d o; won’t be21．I don't know if he___tomorrow．I f he ___，I'll tell you．A．will e；es B．es；esC．es；will D．is ing；is ing22.If you _____ to the party, you’ll have a great time.A. will goB. wentC. goD. going23. It will be a long time ____ Peter _____ his work. A. since, has finished B. after, finishes C. when, will finis h D. before, finishes.24. What will father _____ us from Ja pan?A. takeB. bringC. carryD. ma ke25. Weifang is famous ______ kites.A. forB. toC. onD. with26． I ____ her the answer if she ___ _me.A. can tell, will askB. will tell, will askC. would tell, askD. will tell, as ks27. – What are you going to do tomor row?--We’ll go to the library tomorrow if it ____.A. isn’t rainB. rainC. won’t rainD. doesn’t rain28.—Do you know when he will e back tomorrow?--Sorry, I don’t know. When he ____ b ack, I’ll tell you.A. esB. will eC. eD. may e真的不掉线吗？？、？？？？？？？？？？？？29. What will you do if you _____ to the old folk’s home visit?A. goB. wentC.goingD. will g o30. If I eat ____ food, I’ll be very fat.A. too manyB. many tooC. too mu chD. much too31. I’ll give the book to him if he _ __ here next Sunday.A. will eB. esC. is ingD. c ame32. There ____an English film in our school tomorrow.A. is going to haveB. will haveC. is going to beD. has33. Could you tell us where ____？A. will the next Olympic Games heldB. the next Olympic Games will be hel dC. would the next Olympic Games be he ldD. the next Olympic Games would be he ld34. When my mother returned last nigh t, I ____ a book.A. readB. am readingC. was rea dingD. am going to read35.What ____ you ____ when it began t o rain?A. do, doB. were, doingC. are, do ingD. did, do36. I’ll wake you up when he ____bac k.A. willB. is going to eC. esD.e二．在正确的答案下划一条线。
if引导的条件状语从句(讲义及解析)
if引导的条件状语从句（讲义及解析）状语用来表示行为发生的时刻、地点、目的、方式、程度等，通常由副词或介词短语充当，也可由一个句子充当。
I slept at home yesterday because I had a bad cold.状语从句状语从句指句子作状语。
依照其作用可分为时刻、地点、缘故、条件、目的、结果、让步、方式等从句。
状语从句一样由连词(从属连词)引导。
I will go to school by bike tomorrow if it is sunny.Grammar focus—I think I’ll take the bus to the party.—If you do, you’ll be late.If you take the bus to the party, you’ll be late.—I think I’ll stay at home.—If you do, you’ll be sorry.If you stay at home, you’ll be sorry.—What will happen if they have the party today?—If they have it today, half the class won’t come.—Should we ask people to bring food?—If we ask people to bring food, they’ll just bring potato chips and chocol ate.if 在本单元句中意为“；”，用于引导即 if 引导的是一个完整的句子，因此一定要有主谓，成为从句，另一个句子则成为主句。
If you go there, I’ll go, too.We will go hiking if it doesn’t rain tomorrow.If Bob leaves tomorrow, I will hold a party for him tonight.if 引导的条件状语从句既能够放在主句前，也可放在主句后。
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是中考中常考的知识点，我们一起来学习一下它的具体用法吧！一、连接词ifif是引导条件状语从句的连接词，表示主句中动作发生的条件。
还是看看具体例子吧！If you get up early, you will catch the bus.如果你早起的话，就能赶上那班公共汽车。
You must see the doctor if you are ill.如果你生病了，就必须去看医生。
二、if引导的条件状语从句的构成构成方式为：“主句+if引导的条件状语从句”或“if引导的条件状语从句+主句”。
在含有条件状语从句的复合句中，如主句在前，从句在后，主从句之间不用标点；如要强调从句的内容，则把从句放在主句的前面，这时主从句之间要用逗号隔开。
例如：I will go to his birthday party if he invites me.=If he invites me, I will go to his birthday party.三、if引导的条件状语从句的时态在一般情况下，如果主句谓语动词表示将来的意义，从句谓语动词用一般现在时表将来。
常见的有以下几种：1. 主句是一般将来时。
例如：You will be late for school if you get up late.如果你起晚了，上学将会迟到。
If it rains tomorrow, we won't go to the Great Wall.如果明天下雨，我们就不去长城。
2. 主句的谓语动词是want, hope, wish等词。
例如：I hope to visit her if I'm free.如果我有空，我希望去拜访她。
3. 主句的谓语动词含can, may, must等情态动词。
例如：If I finish my homework, I can watch TV.如果我完成了家庭作业，就可以看电视。
if引导的条件状语从句
If引导的条件状语从句
II.用法。 • (1).条件状语从句通常由连词if引导，if意为“如果；假 如“，主句不能用be going to 表示将来，而应该用shall 或will. Eg: If you leave now, you will be regretful. 如果你现在离开，你会后悔的。 (2).if 意为“如果”，引导条件状语从句时，若主句用一般 将来时，从句则用一般现在时；若主句用一般过去时，从 句也要用表示过去的相应时态。 Eg: If it rains tomorrow, I won’t climb the hills. 如果明天下雨，我就不去爬山。 If I didn’t apologize, I would feel guilty. 如果我不道歉，我会感到内疚。
注意：宾语从句的if与条件状语从句if 的用法有所区别。 宾语从句的if 表示“是否”，相当于whether , if 引导宾 语从句时，从句时态需要根据具体的语境来确定。 Eg: I don’t know if it 道明天是否会下雨。
III. Do exercise. • III. 用if 引导的条件状语从句改写句子。 • 1. It will snow tomorrow. We will build a snowman. If it snow tomorrow, we will build a snowman. ____________________________________________. • 2. You have a computer. You can use it to do a lot of things. If you have a computer, you can use it to do a lot of things. 3. I have time. I’ll drop in on you. If I have time, I’ll drop in on you.
If引导的条件状语从句
• 注意事项 • 1. 在if引导的条件状语从句中，当主句是一般将
来时时，不能够使用be going to结构，而要用 will。 • 例如： I’ll help you with your English if I am free tomorrow. 如果明天我有空，我会帮你学英 语。
• 2. 在if引导的条件状语从句中不能够使用some， 而要用any。
I won’t go there _____ I _____hear from you. I won’t go to the party if I am not invited. (同义 句) unless I won’t go to the party_____ I am invited.
变换：
If 引导的宾语从句的时态由主句及本身时 态决定；
2.If it doesn’t rain , we’ll hold it.
If 引导条件状语从句的时态为一般现在时 记住“主将从现”
1 If I _d_o_n_’_t _u_n_d_e_rs_t_an_d__(not understand）, I will ask my teacher for help .
7. If your brother ____b_r_e_a_ks____(break) the window , he will feel very sorry for that .
8. If the computer doesn’t work (not work), mend it please .
知识回顾 Knowledge Review
放映结束 感谢各位批评指导！
谢 谢！
让我们共同进步
11. If you ___a_re_____(be) happy , we will be happy .
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.如果你考试不及格,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”。
if引导的条件状语从句
if引导的条件状语从句引导条件状语从句最常用的连词是if，常见的if条件状语从句表示在某条件下，某事很可能发生，条件是可能存在的，主句中某种情况发生的概率也是很高的。
If you fail in the exam，you will let him down．If you have finished the homework，you can go home．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，表示对现在或过去的一种假设。
If I were you，I would invite him to the party．I would have arrived much earlier if I had not been caught in the traffic．1.时态应用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。
（前后时态一致原则）2.总结在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 can walk there if we can't find a bus.If it rains tomorrow, we will not go to the zoo.What will you do if you find a panda in danger.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.3.句式转换1）运用“祈使句+ and / or + 句子（一般将来时）”进行转换。
其中，句意表示顺承时用and，表示转折时用or（否则），If you work hard, you’ll pass the exam easily.= Work hard, and pass the exam easily.= Work hard, or you won’t pass the exam easily.2) 运用without 或with转换条件状语从句If there is no water, fish will die.= Fish will die without water.练习：用括号内所给词的正确形式填空。
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1.如果明天不下雨，我就和同学们去野餐。
2.如果周日你去购物的话，我就去。
3.如果你想减肥（loseweight），就锻炼身体吧。
4.如果冬天来了，春天还会远吗？
5.如果可能的话，我就去火车站接你。
Key：
1.Ifitdoesn’traintomorrow,Iwillhaveapicnicwithmyclassmates.
如果我是你，我就不会那么做的。
Ifyougavemesomemoney,Iwouldbeveryhappy.?如果你给我一些钱，我就会很高兴的。
【边学边做】用括号内所给词的正确形式填空。
1.Whatwillyoubuyifyou________（have）alotofmoney?2.Ifit________（notsnow）tomorrow,wewillfeelunhappy.3.Youmustn’tgotoschoolifyou________（be）stillinbed.4.Ifhe_______（be）athomeatthattime,hewouldknowit.5.Pleaseshowmethewayifyou________（know）it.6.Youwillhurtyourteethifyou________（eat）toomuchcandy.7.Ifyougavemeatoycar,I_________（be）veryhappy.8.IwouldgettheprizeifI_________（work）hard.
③主句为祈使句，if从句用一般现在时态。
Don’tjumpintotheriverifyoufeelveryhot.?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。
IfIwereyou,Iwouldn’tdoitlikethat.
if引导的条件状语从句
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）。
Wewillstayathomeifitrainstomorrow.
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。
Ifyoufinishyourhomework,youcangohomenow.如果你做完了作业，你现在可以回家了。
2.IwillgoshoppingonSundayifyoudo.3.Takesomeexerciseifyouwanttoloseweight.
4.Ifwintercomes,canspringbefarbehietrainstation.