if引导的条件状语从句讲解和练习(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。
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(讲义及答案)
if引导的条件状语从句（讲义及答案）You will keep healthy if you do more exercise.If you do more exercise, you will keephealthy.1.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 itbetter. If she goes to New York tomorrow, I will go there,too.My sister will be very happy if our uncle comes next week.练习：If Nancy the exam, she will go to Australia forEnglish study.A.passB. passedC. passesD. will passIf the weather fine, we have a sports meeting next weekend.A. will be; willB. is; willC. was; wouldD. 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 next year, you must learn English hard.主祈从现Let’s go out for a walk if it doesn’t raintomorrow. If you see a snake in the forest, don’tmove!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 an hour, I will go therealone.You will feel worse unless you go to see the doctor right now.You will feel worse if you don’t go to see the do ctor right now.练习：you read it, you can’t imagine how interesting the story is.A. UnlessB. BecauseC. AlthoughD. If —Please give Alice the story book you see her.—All right.A.unlessB. orC. butD. ifExercises一、单项选择( )1. Studying in groups is necessary you want to do well in school.A.ifB. untilC. unlessD.though ( )2. —Will you help me with the trouble?—I won’t you tell me the truth.A. ifB. butC. afterD. unless( )3. If Bob away from the junk food, he will be in good health.A. stayB. will stayC. staysD.stayed ( )4. If Tom thegame, we’ll give him a surprise.A. winB. winsC. wonD.winning ( )5. We’ll go to the park if ittomorrow.A. won’t rainB. don’t rainC. doesn’t rainD.rain ( )6. If you’re more careful, youmuch better.A. doB. will doC. are doingD. did( )7. If there no buying and selling of animals, there no killing in nature.A. is; will beB. will be; will beC. is; isD. will be; is( )8. I’m waiting for my friend. If he ,Iswimming alone.A. doesn’t come; goB. won’t come; goC. won’t come; will goD. doesn’t come; will go二、翻译9.如果明天不下雨，我会去看你的。
If引导地条件状语从句讲解与练习.doc
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 for C, 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 is10月份语法测试成绩 P40学生缴费日期表。
If 引导的条件状语从句讲解与练习.doc
If 引导得条件状语从句讲解与练习If引导条件状语从句得条件状语从句最常用得连词就是if,常见得if 条件状语从句表示在某条件下,某事很可能发生,条件就是可能存在得。
如: If you ask him,he will help you.如果您请她帮忙,她会帮您得。
If you fail in the exam,you will let him down.如果您考试不及格,您会让她失望得。
If you have finished the homework, you can go home.如果您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、如果她用跑得,她就会及时赶到那儿。
The cat will scratch you if you pull her tail、如果您拉猫得尾巴,它就会抓您。
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、如果您想减肥,您必须少吃面包。
(另外,if从句还表示不可实现得条件或根本不可能存在得条件,也就就是一种虚拟得条件或假设。
从句多用一般过去时或过去完成时,表示对现在或过去得一种假设。
如: If I were you,I would invite him to the party.如果我就是您,我会邀请她参加聚会。
I would have arrived much earlier if I had not been caught in the traffic.要不就是交通堵塞,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 myhomework、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 e, esB、will e, will eC、es, will eD、es, es( )9、I don’t know if Dr、White ______ to the party next week、– I think he will e if he ______ free、A、es; will eB、will e; will beC、es; isD、will e; 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 e backB、when she e backC、when she will e backD、when does she e 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 e 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 is40学生缴费日期表。
if_条件状语从句
if_条件状语从句条件状语从句（讲解&练习）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。
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。
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。
2．if从句用一般现在时，主句用may/might/canIf the fog gets thicker the plane may/might be diverted. 如果雾在大一些，飞机可能就会改在别的机场降落。
If it stops snowing we can go out. 如果雪停了，我们就可以出去。
3．if从句用一般现在时，主句用must/shouldIf you want to lose weight you must/should eat less bread. 如果你想减肥，你必须少吃面包。
5．if从句用现在进行时，主句用一般将来时If you are looking for Peter you’ll find him upstairs. 如果你是在找彼得，上楼就会找到他。
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。
条件句表真实，主将从现要遵从；条件句非真实，虚拟语气用到位。
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。
If 引导地条件状语从句讲解与练习.doc
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 fa ther ___ 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 is40学生缴费日期表。
完整版)if条件状语从句练习及答案
完整版)if条件状语从句练习及答案I。
单项选择1.If you go to the party。
you'll have a great time.2.It will be a long time before Peter finishes his work.3.What will XXX?4.XXX.5.I will tell her the answer if she asks me.6.We'll go to the library tomorrow if it doesn't rain.7.Sorry。
I don't know。
When he comes back。
I'll tell you.8.What will you do if you go to the old folk's home visit?9.If I eat too much food。
I'll be very fat.解析：本文没有明显的段落错误，只有格式错误。
需要将每个问题和选项分开，使用标点符号进行分隔。
同时，将错误的单词或语法进行修改，使其符合语法规则。
1.I'll give the book to him if he comes here next Sunday.2.There is going to be an English film in our school tomorrow.3.Could you tell us where the next Olympic Games will be held?4.When my mother returned last night。
I was reading a book.5.What were you doing when it began to rain?6.I'll wake you up when he comes back.1.If you feel tired。
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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。
答案：C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……”。
绿色通道：祈使句后面既可以加and，也可以加or，所以要全面分析句意，再作决定。
小试牛刀：用if连接下列句子1、Go to bed early and you will have a good rest.2、Hurry up, or you’ll miss the bus.三、if从句与主句具有以下特点：1．If从句中用一般现在时，表示未来的一种条件，从句中可以加时间状语。
e.g.If you can’t come tomorrow, we can hold the party a little later.明天你如果不能来，我们可迟一点举行宴会。
If it doesn’t rain tomorrow, we’ll go to the Great Wall. 明天如果不下雨，我们就去长城。
2．当if表示未来的条件时，主句中用一般将来时，从句用一般现在时，即“主将从现”。
表示如果某种条件存在，就有可能/不可能发生什么事情。
e.g.If you don’t get up early, you will be late for school.你如果不早点起床，上学就会迟到。
If I play games on it, it will go wrong. 如果我用它玩游戏，它就会坏掉。
3．if从句可放在主句前或主句后，从句置于主句前时，须用逗号与主句隔开，反之则不用逗号。
e.g.If it’s fine tomorrow, we can go out. 如果明天天气好，我们就能出去。
She will be happy if she joins the party. 如果她参加聚会她会很开心的。
I’ll ask the teacher for help if I don’t understand. 如果我不懂我会求助老师的。
三．注意if引导的条件状语从句和宾语从句的区别if可以用来引导宾语从句也可以用来引导条件状语从句，主要是要弄清if引导从句的时态。
if在引导宾语从句时，意为“是否”。
要根据实际情况来确定时态，而if在引导条件状语从句时意为“如果，假设”，要用一般时代替将来时，即“主将从现”。
e.g.I want to know if he will come here tomorrow.我想知道他明天是否到这儿来。
（if在上句引导的是宾语从句，从句中有很明显的表将来的时间状语tomorrow，所以if从句要用一般将来时。
）e.g.If it rains tomorrow, we’ll put off the sports meeting.如果明天下雨，我们就推迟运动会。
（if在上句引导的是条件状语从句，尽管从句中也有表将来时的时间状语tomorrow，从理论上讲也应该用一般将来时，但是在if引导的条件状语从句中要用一般现在时代替一般将来时，故从句谓语用rains而不用will rain. ）二、典题分析1、（2010上海）We will have no water to drink we don’t protect the earth.A. untilB. beforeC. thoughD. if[答案]D．[解析] if 引导条件状语从句，表示“如果”。
意思是如果我们不保护地球，我们将会没有水喝。
2、（2011 重庆）We will plant trees tomorrow, and I don’t know Tom will come and join us.A. ifB. whichC. whatD. where[答案]A．[解析] if 引导宾语从句，表示“是否”。
意思是我们明天将会去植树，但是我不知道Tom会不会去。
3、—Do you know if finished the work? —Not yet. If he , he will give me a call.A. he’s, will finishB. he’ll, finishesC. he’s , finishesD. he’ll , will finish[答案]C．[解析]问句的if 引导宾语从句，表示“是否”，从句要用陈述语序，从答句Not yet.中可以看出从句应该用现在完成时态，答句的if 引导状语从句，要遵循主将从现的规律。
练习一、用if 连接下面的句子：1、 You do not understand the article. Ask your teacher.2、 You want to know more about it. Please call your teacher.3、Tell him to make a phone call to me. He will come here tomorrow.4、You want to go. Please tell me.5、Look at our website. The camera does not work.二、用所给的提示词组成一个if引导的条件状语从句。
1、 be tired, have a rest (Tom)2、 not go to bed early, feel sleepy (you)3、 become unhealthy, not eat vegetables (children)4、 not listen to the teacher, not study well (I )5、 fall behind others in studying, spend too much time on the games (Da Wei)三、单项选择：1. You are sure to pass the exam ___ you study hard.A. ifB. thoughC. thatD. since2. I'll go to see the film with you___I have time this evening.A. whetherB. soC. ifD. when3. ___ you study harder, you'll never pass the final exam.A. IfB. UntilC. UnlessD. Except4．We’ll stay at home if it ______ this afternoon.A．rain B．rains C．to rain D．raining5．We will go to the Great Wall if it ______tomorrow.A．won’t rain B．isn’t raining C．rained D．doesn’t rain 6．—I don’t know if he ______.—He will come if it ______.A．comes; won’t rain B．will come; doesn’t rain C．comes; doesn't rain D．will come; won’t rain7．Do you know what time ______？A．the train leave B．does the train leaveC．will the train leave D．the train leaves8．Do you think if______ an English film tomorrow night？A．is there B．there is going to haveC．there is going to be D．will there be9．Will you please tell me ______？A．where Pudong Airport is B．how far Pudong Airport wasC．how can we get to Pudong Airport D．when was Pudong Airport built10．—Mike wants to know if______ a picnic tomorrow.—Yes. But if it ______, we’ll visit the museum instead.A．you have; will rain B．you will have; will rainC．you will have; rains D．will you have; rains11．—Why didn’t Nick come to school yesterday？—______ he was ill.A．After B．Where C．When D．Because12．This box is ______ heavy ______ I can’t carry it.A．too; to B．so; that C．very; that D．too; that13．I don’t know ______ he still lives here.A．where B．what C．when D．whether14. ---Do you know if he _______ to play basket ball with us?---I think he will come if he ______ free tomorrow.A. comes; isB. comes; will beC. will come; isD. will come; will be15. In the zoo if a child _____ into the water and can’t swim, the dolphins may come up ______ him.A. will fall; to helpB. falls; to helpC. will fall; helpD. falls; helping16.In the bookshop，a reader asked the shop keeper ___Who Moved My Cheese was an interesting book.A.thatB.howC.whatD.if17、I want to know ________ you have a brother.A.ifB.thatC.thoseD.them18、We will go hiking if it tomorrow.A.will be fineB.is fineC.be fineD. is gong to be fine19、Maybe you if you make some bad friends.A.go wrongB. will go wrongC.going wrongD. is going to be wrong20、—Do you know if finished the work?—Not yet. If he , he will give me a call.A. he’s, will finishB. he’ll, finishesC. he’s , finishesD. he’ll , will finish答案：1-5 ACCBD 6-10 BDCAC 1-15 DBDCB 16-20、DABBC。