if引导的条件状语从句讲义及答案
2019年秋人教版八年级Unit 10 if引导的条件状语从句讲和练(含答案及解析)
2019年秋八年级上册单元语法讲与练if引导的条件状语从句语法精讲1.条件状语从句的含义由一个主句和一个或一个以上的从句构成的句子叫复合句。
在复合句中作状语的句子叫作状语从句。
状语从句根据它表达的意思可分为很多种，if引导的句子在复合句中表示条件，作主句的条件状语，因此称为条件状语从句。
If you don’t hurry，you’ll be late.如果你不快点，你将会迟到的。
If he comes，let me know.如果他要来，通知我。
2.if引导的条件状语从句的结构if引导的条件状语从句在句中的位置比较灵活，可以放在主句之前(这时要和主句用逗号隔开)，也可以放在主句的后面(不用逗号)。
条件状语从句的结构为：if+陈述句，主语+谓语(=主语+谓语+if+陈述句)。
意为“如果……就……”。
If you ask him，he will tell you the answer.如果你问他，他就会告诉你答案。
I hope to visit her if I’m free.如果我有空，我希望去看望她。
3.if引导的条件状语从句与主句时态的一致性在复合句中，从句中动词的时态在一定程度上受到主句动词时态的制约，英语语法中称为时态呼应。
（1）在含有条件状语从句的复合句中，如果主句是一般将来时，从句则用一般现在时代替一般将来时表将来。
If it rains，I will stay at home.如果下雨，我将待在家里。
If you study hard，you will pass the examination.如果你努力学习，就能通过这次考试。
（2）如果主句含有must，may，can等情态动词，从句也要用一般现在时。
If you drive too fast，you may have an accident.如果你把车开得太快，你可能会出事故。
You must stop if the traffic light is red.如果红灯亮了，你必须停下来。
知识点名：if引导的条件状语从句
知识点名：if引导的条件状语从句讲义：if引导的条件状语从句1. if意为“如果”，引导条件状语从句时，既可放在主句前面，也可放在主句后面。
若if条件句放在句首，从句后面常加逗号与主句隔开。
If you go there, I'll go, too.如果你去那儿，我也会去。
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。
2. 时态运用：在含有if引导的条件状语从句的主从复合句中，主句为下列情形之一的，条件状语从句通常用一般现在时。
(1) 主句是一般将来时，即遵循“主将从现”的原则。
If he comes, he will bring his violin.如果他来，他就会把他的小提琴带来。
(2) 主句是含有情态动词may/might/can/must/should等的句子。
If you want to lose weight, you must eat less bread.如果你想减肥，你必须少吃面包。
(3) 主句是祈使句。
If you are not strong enough, please don't take part in such an activity.如果你不是很健壮，请不要参加这种活动。
3. 句型转换：(1) 借助“祈使句+and/or+陈述句（一般将来时）”这一句型来转换。
其中，在句意上and表示顺承；or表示转折，意为“否则”。
If you work hard, you'll pass the exam easily.=Work hard, and you'll pass the exam easily.努力学习，你将很容易通过考试。
Work hard, or you won't pass the exam easily.努力学习，否则你不会轻易地通过考试。
If引导两种从句宾语从句及条件状语从句
重点、难点1.含有 if 指引的条件状语从句的复合句中主从句的时态。
2.If 指引的宾语从句与条件状语从句的差别。
考情剖析往常在单项选择、完形填空或补全、达成句子等题型中考察，分值约3— 4 分。
知能提高（一）知识解说【认知解说】I. if 指引的宾语从句if 指引宾语从句时，意思为：能否，从句的时态往常要和主句保持一致。
【例句】I want to know if he lives there.我想知道他能否住在那边。
He asked me if I could help him.他问我能否能帮他。
【考察点】 if、 whether 指引的宾语从句的差别1. if 或 whether 指引宾语从句时，作“能否”讲，常放在动词ask、see、say、know 和 find out 等后边。
一般状况下，二者常可换用，在口语中多用if。
【例句】Nobody knows whether / if it will rain tomorrow.没有人知道明日能否下雨。
Lucy asked whether / if they had a cotton sweater.露西问他们能否有棉制的毛衣。
2.if 或 whether 指引宾语从句时，要注意三个方面，即连词、语序和时态。
if 或 whether 既不可以和t hat或其余连词（副词）同时使用，也不可以省略。
【例句】我不知道他今日能否会来。
[误 ] I don’ t know that if(whether) he will come here today.[正 ] I don’ t know if(whether) he will come here today.他走过来看看猫能否出了缺点。
[误 ] He came to see what if (whether) there was anything wrong with his cat .[正 ] He came to see if (whether) there was anything wrong with his cat .if 或 whether 指引宾语从句时，虽拥有疑问的意义，但其从句应用陈说句的语序。
新概念第二册第16课if引导的条件状语从句讲解和练习(基础题)
条件状语从句一、条件状语从句通常由if（如果）, unless（除非），as long as（只要）引导。
例如：If it rains tomorrow, we won’t go to the park. 如果明天下雨，我们就不去公园了。
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。
Our parents will be pleased with our performance as long as we try our best.小试牛刀：1、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.2、如果人人为保护环境做出贡献，世界将会变得更美好。
______ ______ ______ _____ _______ to protecting the environment, the world will become much more beautiful.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. =If you study hard, you will pass the exam.Hurry up, or you’ll be late. =If you don’t hurry up, you’ll be late.考题Work hard，________ you may catch up with your classmates soon.A.orB.butC.andD.yet思路解析：本句是“祈使句＋and”的句型，句意为“努力学习，你会很快赶上其他同学的”，and在句中表示承接关系，所以选C项。
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讲解和练习(答案)
条件状语从句一、条件状语从句通常由if（如果）, unless（除非），as long as（只要）引导。
例如：If it rains tomorrow, we won’t go to the park. 如果明天下雨，我们就不去公园了。
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。
Our parents will be pleased with our performance as long as we try our best.小试牛刀：1、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.2、如果人人为保护环境做出贡献，世界将会变得更美好。
______ ______ ______ _____ _______ to protecting the environment, the world will become much more beautiful.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. =If you study hard, you will pass the exam.Hurry up, or you’ll be late. =If you don’t hurry up, 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思路解析：本句是“祈使句＋and”的句型，句意为“努力学习，你会很快赶上其他同学的”，and在句中表示承接关系，所以选C项。
If引导的条件状语从句讲解与练习
I f引导的条件状语从句讲解与练习LELE was finally revised on the morning of December 16, 2020If 引导的条件状语从句讲解与练习If引导条件状语从句的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。
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。
If you have finished the homework， you can go home．如果你作业做完了就可以回家了。
1．if从句用一般现在时，主句用一般将来时If he runs he’ll get there in time.如果他用跑的，他就会及时赶到那儿。
The cat will scratch you if you pull her tail.如果你拉猫的尾巴，它就会抓你。
2．if从句用一般现在时，主句用may/might/can/must/shouldIf it stops snowing we can go out. 如果雪停了，我们就可以出去。
If you want to lose weight you must/should eat less bread.如果你想减肥，你必须少吃面包。
(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。
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。
I would have arrived much earlier if I had not been caught in the traffic．要不是交通堵塞，我本会来得早一些。
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……”。
名师讲解：if引导的条件状语从句
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.
参考答案:
1 have 2 doesn’t 3 are 4 were 5 knew 6 were to eat 7 would be 8 worked
名师讲解：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）。
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gave me some money, I would be very happy.如果你给我一些钱，我就会很高兴的。
八下第五单元if引导的条件状语从句讲解
If引导条件状语从句。
在含有条件状语从句的主从复合句中，当主句谓语动词以某种形式表示将来时间概念时，条件状语从句中的谓语动词通常要用一般现在时代替一般将来时。
此句中主句为用祈使句表将来，if引导的状语从句用一般现在时。
If you see him , give him this letter .如果你见到他的话，把这封信给他。
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。
I would have arrived much earlier if I had not been caught in the traffic .如果没有堵车，我会到的早一点儿。
四. 课文知识点详解1. He lent me his CD recorder.他把他的CD机借给了我。
lend将某物借给某人（1）主语+lend+人+物I lent a friend a pen .（2）主语+lend+物+to+人I lent money to a friend .borrow 向某人借某物主语+borrow+物+from+人I borrowed a book from my teacher .2. If you want to send your recording by email , connect the recorder to your computer .如果你想通过电子邮件的方式发送你的录音，你要把录音连接到电脑上。
if引导的条件状语从句精讲与专题练习（2）
八年级英语：i f引导的条件状语从句常见的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。
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。
If you have finish ed the homewo rk，you can go home．如果你作业做完了就可以回家了。
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。
如：If I were you，I wouldinvite him to the party．如果我是你，我会邀请他参加聚会。
(不能用was)I wouldhave arrive d much earlie r if I had not been caught in the traffi c．要不是交通堵塞，我本会来得早一些。
另外你还要注意if 条件句的时态搭配1．if从句用一般现在时，主句用一般将来时If he runs ，he’llgettherein time.如果他用跑的，他就会及时赶到那儿。
The cat will scratc h you if you pull her tail.如果你拉猫的尾巴，它就会抓你。
2. if从句用一般现在时，主句用may/might/canIf the fog gets thicke r the planemay/mightbe divert ed.如果雾在大一些，飞机可能就会改在别的机场降落。
中考英语题型专题复习讲义if引导的条件状语从句
语法二:if引导的条件状语从句【语法示例】1.如果你去参加派对，你会玩的很开心！______you go to the party,you ______ have a great time!2.如果我们今天举办（聚会），一半的学生不会来。
______they have it today,half the class ______ come.3.如果你那样做，你将会很遗憾。
______ you do, you______be sorry. 【语法概述】在复合句中作条件状语的句子叫__________________.条件状语从句常用______ 来引导。
If 引导的条件状语从句表示假如______的动作发生，______的动作就（不）会发生。
【句子结构】If 引导的条件状语从句位置灵活，可直接放在主句后面，也可以放在句首。
放句首时，从句后面要用逗号和主句隔开。
1.主将从现：主句____________，从句____________。
①如果我有时间，我将会去看你。
I______ go to see you ______ I have time.②如果明天下雨，我们将待在家里。
______ it rains tomorrow, we______ stay at home.2.主情从现（may,might,can,must,should等）：主句____________，从句____________。
如果你吃变质的食物，你可能会生病。
______ you eat bad food,you ______ be ill.3.主祈从现：主句____________，从句____________。
如果灯是红的，等一会儿。
______ the light is red,______ ______ a minute. 【同义句转换】1. 用“祈使句+and/ or+一般将来时的句子”转换。
and表顺承关系，or表否则。
【教育资料】if引导的条件状语从句(讲义及答案)学习精品
if 引导的条件状语从句（讲义）状语用来表示行为发生的时间、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。
根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式等从句。
状语从句一般由连词(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 chipsand chocolate.1.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，所以一定要有主谓，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.2.if 引导的条件状语从句既可以放在主句前，也可放在主句后。
if引导的条件状语从句(讲义及答案)
if 引导的条件状语从句（讲义）状语用来表示行为发生的时间、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。
根据其作用可分为时间、地点、原因、条件、目的、结果、让步、方式等从句。
状语从句一般由连词(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 chipsand chocolate.1.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，所以一定要有主谓，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.2.if 引导的条件状语从句既可以放在主句前，也可放在主句后。
If引导的条件状语从句讲解与练习
If 引导的条件状语从句讲解与练习If引导条件状语从句的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。
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。
If you have finished the homework，you can go home．如果你作业做完了就可以回家了。
1．if从句用一般现在时，主句用一般将来时If he runs he’ll get there in time.如果他用跑的，他就会及时赶到那儿。
The cat will scratch you if you pull her tail.如果你拉猫的尾巴，它就会抓你。
2．if从句用一般现在时，主句用may/might/can/must/shouldIf it stops snowing we can go out. 如果雪停了，我们就可以出去。
If you want to lose weight you must/should eat less bread.如果你想减肥，你必须少吃面包。
(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。
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。
I would have arrived much earlier if I had not been caught in the traffic．要不是交通堵塞，我本会来得早一些。
)If条件状语从句练习( )1. If I find his phone number, I ______ you.A. tellB. toldC. will tellD. have told( )2. I __ the CDs to you if I have time tomorrow.A．will return B. returned C. have returned D. return( )3. The students will go to the Summer Palace if it ________tomorrow.A. won' t rainB. isn' t rainingC. doesn' t rainD. isn' t rain ( )4. I won’t watch the TV play if my father ___ me do my homework.A. letB. will letC. won’t letD. lets( )5. If you ___quiet, I’ll tell you what happened.A. willB. are C are to be D be( )6. If you go to the party, you ___ a good time.A. would haveB. haveC. will haveD. had( )7. Don’t worry. Peter will call you as soon as he _____ London.A. will get toB. gets toC. get toD. got to( ) 8.He doesn’t tell me when he __. I’ll telephone you as soon as he ___.A. will come, comesB. will come, will comeC. comes, will comeD. comes, comes( )9.-- I don’t know if Dr. White ______ to the party next week.–-- I think he will come if he ______ free.A. comes; will comeB. will come; will beC. comes; isD. will come; is( )10. I don’t know if there ____ a sports meeting next month. If they _____ it, I must get ready for it.A. is; will holdB. will be; holdC. will be; will holdD. will have; hold宾语从句练习( ) 1. I don’t know ___________________.A. what does he like bestB. what he like bestC. what he does like bestD. what he likes best( ) 2. Can you tell me ______________________?A. where she livesB. where does she liveC. she lives whereD. where she live( ) 3. He asked me _______________________________.A. what time is itB. what time it isC. what time was itD. what time it was( ) 4. Do you know _______________________?A. how much did it costB. how much it did costC. how much it costsD. how much does it cost( ) 5. The man asked her _______________________.A. why did she do itB. why she did itC. why she doesD. why does she do it( ) 6. Nobody knows _________________________.A. when will she come backB. when she come backC. when she will come backD. when does she come back ( ) 7. Mum asked _______________________________.A. where he wasB. where was heC. where he isD. where is he( ) 8. Do you know _______________________________?A. what they are looking forB. what are they looking forC, they are looking for what D. what do they look for ( ) 9. The teacher asked ________________________________.A, who can answer this questionB. who could answer the questionC. what question did she askD. she answered this question( ) 10. I asked her ______________________________.A. whether he has been to AustraliaB. whether has he been to AustraliaC. whether he had been to AustraliaD. whether he goes to Australia( ) 11. The teacher told us ________________________________.A. that light traveled faster than soundB. if light traveled faster than sound.C. that light travels faster than soundD. if light travels faster than sound( ) 12. He said that __________________________________.A. he is doing his homeworkB. he does his homeworkC. he was doing his homeworkD. he do his homework( ) 13. I asked him _________________________.A. where did he goB. where he wentC. where does he goD. where he did go( ) 14. --Excuse me, could you tell me _____ get to the plane?--Certainly. Go straight alone here.A. how can weB. how we canC. when can weD. when we can( ) 15. Do you know _____he will ride here at 8 tomorrow morning?A. whenB. whereC. whetherD. how( ) 16. --Can you tell me why __________________?--Because I want to help the people there.A. do you go to TibetB. did you go to TibetC. are you going to TibetD. you are going to Tibet ( ) 17. Do you know _______________________________?A. what time does the train leaveB. what time leaves the trainC. what time the train leaveD. what time the train leaves( ) 18. Could you tell me _______________________?A. who is heB. where’s the nearest restaurantC. if he will come tomorrowD. which way is to the underground station( ) 19. --Do you know ___________?--Sorry. I don’t know. You may ask the woman over there.A. when the shop opensB. when is the shop openC. when does the shop openD. when will the shop open ( ) 20 --Dad, do you know ____________? --In half an hour.A. when will the football game startB when the football game will startC. when is the football game going to startD. when shall we start the football game( ) 21. Could you tell me _______________________?A. which bus they are waiting forB. which bus are they waiting forC. they’re waiting for which busD. which bus they wait( ) 22. I asked her __________________________.A. whether did she like the red oneB. whether she likes the red oneC. whether does she like the red oneD. whether she liked the red one( ) 23. Can you guess (猜）__________the people in the picture are ?A. whenB. whomC. whoseD. who( ) 24. I’m thinking about ________________________________.A. if I’ll help herB. whether I’ll help herC. what I’ll help herD. that I help her( ) 25. --We never know _____________. --They say he is a teacher.A. what the old man isB. what is the old manC. who is the old manD. which the old man is40aaaaa 学生缴费日期表aa。
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if 引导的条件状语从句（讲义）
状语
用来表示行为发生的时间、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。
根据其作用可分为时间、地点、原因、条件、目的、结果、让步、 方式等从句。
状语从句一般由连词（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
—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 happe n if they have the party today?
——If they have it today, half the class won
—Should we ask people to bring food?
—If we ask people to bring food, they and chocolate.
1 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，所以一定要有主谓，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 toni ght.
2 if 引导的条件状语从句既可以放在主句前，也可放在主句后。
但是如果放在主句前，即句首时，从句后面要用
与主句
隔开。
You will keep healthy if you do more exercise. If you do more
ll be late.
t come. ll just bring potato chips
exercise, you will keep healthy.
3时态：if引导的条件状语从句用____________________ 表示将来，主句可以使用一般将来时，含有情态动词的句子或者祈使句。
主将从现If you practice speaking English more, you will like it better. If she
goes to New York tomorrow, I will go there, too.
My sister will be very happy if our uncle comes n ext week. 练习：
If Nancy ______ the exam, she will go to Australia for En glish
study.
A. pass
B. passed
C. passes
D. will pass
If the weather ______ fine, we ______ have a sports meeti ng n ext weeke nd.
A. will be; will
B. is; will
C. was; would
D. was; will
主情从现
If you get up at six tomorrow morning, you can catch the first bus.
If you go to study in America n ext year, you must lear n En glish hard.
主祈从现
Let ' s go out for a walk if it doesn ' t rain tomorrow. If you see a snake in the forest, don ' t move!
unless
也可引导条件状语从句，表示“如果不，除非” Unless
he comes here in an hour, I will go there alone. If he doesn' t come here in aour, I will go there alone.
You will feel worse unl ess you go to see the doctor right now.
You will feel worse if you don ' t go to see the docto练ight now.
习：
______ y ou read it, you can ' t imagine how interesting tise story A. U nless _ B. Because C. Although D. If
—Please give Alice the story book _______ y ou see her.
—All right.
A. unless
B. or
C. but
D. if
Exercises
、单项选择
)1. Study ing in groups is n ecessary in
school.
exam.
11. 如果你不告诉我原因，我会告诉妈妈这件事
12. 我不会去医院的，除非你和我一起去那儿。
【参考答案】
you want to do well A. if B. un til C. uni ess )2. — Will you help me with the trouble?
—I won't _you tell me the truth.
B. but
C. after
D. though A. if D. uni ess )3. If Bob
health.
_away from the junk food, he will be in good A. stay
B. will stay )4. If Tom _____ the game, we A. win
B. wi ns )5. we llgo to the park if it ____ A. won' rain
)6. If you
A. do
)7. If there _
C. stays
D. stayed 'll give himuaprise. C. won D. wi nning tomorrow. B. don' rain C. doesn ' rain D. rain recaorful, you B. will do ____ much better. C. are doing D. did and selli ng of ani mals, there no buying ____ no killi ng in n ature. A. is; will be
C. is; is )8. I ' m waiting myr friend. swimmi ng alone. A. does nt c ome; go C. won ' t comwjll go
二、翻译
9. 如果明天不下雨，我会去看你的。
If it ______________ tomorrow, I
10. 如果Mary 不为考试做准备，她会不及格。
If Mary _____________________ the exam, she B. will be; will be D. will be; is
If he ________ , I
B. won ' t comgo D.
doesn ' t come; wgo you. fail the
Grammar focus
1. 如果；假如；条件状语从句
2. 逗号
3. 一般现在时主将从现
练习：
unless
练习：
A D
Exercises
一、单项选择
1-5 ADCBC
6-8 BAD
二、翻译
9. doesn' t rain; wiVisit
10. doesn' t prepare fcwjll
11. If you don ' t tell me the reason, I will tell mom thi sg.
12. I won ' t go to the hospital uni ess you go there witle.
4。