if 的条件状语从句 if从句时态

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If引导的条件状语从句
一、定义：我们用if句子谈论可能发生的动作或可能出现的情况。
二、用法：
1.当if从句用一般现在时，表将来，主句用一般将来时。
如If you ask him, he will help you.
2.if从句既可位于主句前，也可位于主句后。如果位于主句前，需在if从句后加逗号“，” 。
如If it doesn\'t rain, we\'ll climb themountain tomorrow.
=We\'ll climb the mountain tomorrow,if it doesn\'t rain.
3.含有if从句的复合句中，主句中的will可以用情态动词来代替。
If there is no water, we can\'tlive.
4.含有if从句的复合句中，主句也可以用祈使句。
如：Please stay at home if it blowsheavily tomorrow.
5.同义句转换
用祈使句+“，”+and/or +一般将来时
If you work hard, you\'ll pass theexam easily.
=Work hard, and you\'ll pass the exameasily.
If you don\'t hurry up, you\'llmiss the train.
=Hurry up ,or you\'ll miss thetrain.
含有介词with和without的介词短语
If there is no water, fish can\'tlive.
【if 的条件状语从句 if从句时态】=Fish can\'t live without water.
Unless=If …not 如果不，主将从现
If you don\'t go , I won\'t go.
=Unless you go ,I won\'t go.
if条件状语从句的时态练习
I.单项选择
1.If you _____ to the party, you\'llhave a great time.
a. will go b. went c. go d. going
2.I____ her the answer ifshe____me.
a. can tell, will ask b.will tell, will ask
c. would tell, ask d.will tell, asks
3.–what are you going to dotomorrow?
--we\'ll go to the librarytomorrow if it ___.
a. isn\'t rain b. rain c. won\'t rain d. doesn\'t rain
4. what will you do if you _____to Peter\'s home?
a. go b. went c. going d. will go
5.I\'ll give the book to him ifhe___ here next Sunday.
a. will come b. comes c.is coming d. came
6.If you don\'t like this dress,you _____ give it to Gina.
a. can b./ c. did d. do
7.If you are free,______ the bookto Peter.
a. take b .will take c. took d.takes
II、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) fewertrees, there _______ (be)more pollution.
4. He _____ (dress)more casually if he _______(notwork) on weekdays.
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) ifthey__________ (argue).
8. I______ (have) a sale if I____(need) money for education.
9. Peter ____ (send) me a beautiful souvenir if he____(tour) spain.
10.If mr. green _______ (say) Iam hard- working, my parents _____ (feel) glad.
11. I______ (go) to the beach ifit________ (not rain)this week.
12. ____they ______ (have) amatch 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) inEnglish if he_______(pass) the exams in PekingUniversity.
III. 完成句子(每空不限一词)
1. 他如果看电视太久了，他的父母会不高兴。
If he ___________ TV too much,his parents_________unhappy.
2. 如果明天不下雨，我会和你一起去公园的。
If it _____________tomorrow,I______ go to the park_____you.
3. 如果他有空，他会帮助你的。
If he _______________, he_________ you.
Ⅳ．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 .

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