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1、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 focusI think I ll take the bus to the party.If you do,
2、 you ll be late.ll be late.t come.ll just bring potato chipsIf you take the bus to the party, youI 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 wonShould we ask people to b
3、ring 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，
4、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 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 b
5、e very happy if our uncle comes n ext week. 练习：If Nancythe exam, she will go to Australia for En glishstudy.A. passB. passed C. passes D. will passIf the weatherfine, wehave a sports meeti ng n extweeke nd.A. will be; will B. is; willC. was; would D. was; will主情从现If you get up at six tomorrow mornin
6、g, 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. Ifyou 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” Unlesshe comes here in an hour, I will go there alone. If he doesn t
7、 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：you read it, you can t imagine how interesting tise story A. U nlessB. Because C. Although D. IfPlease give Alice the story bookyou
8、 see her.All right.A. unlessB. orC. butD. ifExercisesyou want to do well、单项选择)1. Study ing in groups is n ecessary in school.A. ifB. un tilC. uni ess)2. Will you help me with the trouble?I wont _you tell me the truth.B. butC. afterD. thoughA. ifD. uni ess)3. If Bobhealth._away from the junk food, he
9、 will be in goodA. stayB. will stay)4. If Tomthe game, weA. winB. wi ns)5. we llgo to the park if itA. won rain)6. If youA. do)7. If there _C. staysD. stayedll give himuaprise.C. wonD. wi nningtomorrow.B. don rain C. doesn rain D. rainrecaorful, youB. will domuch better.C. are doing D. did and selli
10、 ng of ani mals, thereno buyingno killi ng in n ature.A. is; will beC. is; is)8. I m waiting myr friend.swimmi ng alone.A. does nt come; goC. won t comwjll go二、翻译9. 如果明天不下雨，我会去看你的。If ittomorrow, I10. 如果Mary不为考试做准备，她会不及格。If Marythe exam, sheB. will be; will beD. will be; isIf he, IB. won t comgo D. d
11、oesn t come; wgoyou.fail theexam.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】Grammar focus1. 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 DExercises一、单项选择6-8 BAD1-5 ADCBC二、翻译9. doesn t rain; wiVisit10. doesn t prepare fcwjll11. If you don t tell me the reason, I will tell mom thisg.12. I won t go to the hospital uni ess you go there witle.4
if引导的条件状语从句(讲义及答案)
