初中英語(yǔ)——If引導(dǎo)的條件狀語(yǔ)從句

1、if引導(dǎo)的條件狀語(yǔ)從句引導(dǎo)條件狀語(yǔ)從句最常用的連詞是if，常見的if條件狀語(yǔ)從句表示在某條件下，某事很可能發(fā)生，條件是可能存在的，主句中某種情況發(fā)生的概率也是很高的。如： If you ask him，he will help you如果你請(qǐng)他幫忙，他會(huì)幫你的。 If you fail in the exam，you will let him down如果你考試不及格，你會(huì)讓他失望的。 If you have finished the homework， you can go home如果你作業(yè)做完了就可以回家了。 另外，if從句還表示不可實(shí)現(xiàn)的條件或根本不可能存在的條件，也就是一種虛擬的條件

2、或假設(shè)。從句多用一般過(guò)去時(shí)或過(guò)去完成時(shí)，表示對(duì)現(xiàn)在或過(guò)去的一種假設(shè)。如： If I were you，I would invite him to the party如果我是你，我會(huì)邀請(qǐng)他參加聚會(huì)。 I would have arrived much earlier if I had not been caught in the traffic要不是交通堵塞，我本會(huì)來(lái)得早一些。另外你還要注意if 條件句的時(shí)態(tài)搭配1if從句用一般現(xiàn)在時(shí)，主句用一般將來(lái)時(shí) If he runs hell get there in time. 如果他用跑的，他就會(huì)及時(shí)趕到那兒。The cat will scratch

3、 you if you pull her tail. 如果你拉貓的尾巴，它就會(huì)抓你。2if從句用一般現(xiàn)在時(shí)，主句用may/might/canIf the fog gets thicker the plane may/might be diverted. 如果霧在大一些，飛機(jī)可能就會(huì)改在別的機(jī)場(chǎng)降落。If it stops snowing we can go out. 如果雪停了，我們就可以出去。3if從句用一般現(xiàn)在時(shí)，主句用must/shouldIf you want to lose weight you must/should eat less bread. 如果你想減肥，你必須少吃面包。4

4、if從句用一般現(xiàn)在時(shí)，主句用一般現(xiàn)在時(shí)If you heat ice it turns to water. (也可用will turn)如果把冰加熱，它就會(huì)化成水。5if從句用現(xiàn)在進(jìn)行時(shí)，主句用一般將來(lái)時(shí)If you are looking for Peter youll find him upstairs. 如果你是在找彼得，上樓就會(huì)找到他。6if從句用現(xiàn)在完成時(shí)，主句用一般將來(lái)時(shí)If you have finished dinner Ill ask the waiter for the bill. 如果你吃完了，我就叫服務(wù)生來(lái)算賬注意 ：學(xué)習(xí)" if " 引導(dǎo)的條件狀語(yǔ)

5、從句的用法,現(xiàn)在總結(jié)一下: if 條件句不一般,幾個(gè)要點(diǎn)記心間; 條件句,放在前,逗號(hào)要放句中間。 條件句表可能，主句多用將來(lái)時(shí)； 條件句表事實(shí)，主句常用現(xiàn)在時(shí)。在 if 引導(dǎo)的條件狀語(yǔ)從句中，如果從句談?wù)摰氖且粋€(gè)有可能發(fā)生的事實(shí)及其產(chǎn)生的相關(guān)的結(jié)果，主句用一般將來(lái)時(shí)態(tài)，從句用一般現(xiàn)在時(shí)態(tài)。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 條件

6、句談?wù)摰氖侵貜?fù)發(fā)生和預(yù)示要發(fā)生的情景和事件，則主從句大多用一般現(xiàn)在時(shí)態(tài)。如： If bears are in danger ,they attack people.在 if 引導(dǎo)的條件狀語(yǔ)從句中，if 和條件句位置靈活，可直接放在主句后面，若 if 條件句放句首， 從句后面要加逗號(hào)，和主句隔開。還要注意前后時(shí)態(tài)一致原則if 條件狀語(yǔ)從句的時(shí)態(tài)練習(xí) 一在正確的答案下劃一條線。1. Daina (will go/go/goes) to Europe if she (will pass/pass/passes) the exams.2. The graduates (will teach/teach

7、/teaches) in the poor village if the Ministry of Education (will agree/ agree/agrees) soon.3. If there (will be/ are/is) a car accident, they (will call/call/calls) 110 for help at once.4. If it (wont/dont/doesnt/ isnt) rainy, we (will take/ take/takes) walk outside.5. If a UFO (will land/land/lands

8、) in front of me, I (will go/go/goes) in to look for the alien.6. If he (will have/have/has) money, he (will build/build/builds) a science lab.7. Dont wait for me if I (am/ will be) late.8. They (wont/dont) go to the beach if it (will rain/rain /rains).9. I (will call/ call) you if he (will stay/sta

9、y /stays) at home.10. Mr. Smith (will let/ let/lets) you know if he (will need/ need/ needs) help.11. (Will / Do/ Does) he visit the museum if he (wont / dont/ doesnt) get  tired?12. Where (will/ do/does) they live if they (will miss/ miss/ misses) the bus?二、用所給詞的適當(dāng)形式填空1. If you _(feel) tired,

10、you _ (have) to have a rest.2. Where _ he _(see) the film if he _(have) time?3. If there _(be) fewer trees, there _( be) more pollution.4. He _(dress)  more casually if he _( not work) on weekends.5. If Marcia _(live) alone, she _( keep) a pet parrot.6. Lana _( buy) a new dress if the old one _

11、(be) out of style.7. The twins _(fight) if they_(argue).8. I _(have) a bake sale if I _(need) money for education.9. Peter _( send) me a beautiful souvenir if he _(tour) Spain.10. If Mr. Green _(say) I am hard- working, my parents _( feel) glad.11.I _(go) to the beach if it_ ( not rain) this week.12

12、._they _( have) a match 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) in English if he _ (pass) the exams in Peking  University.15.如果他到的晚了會(huì)發(fā)生什么事情？Wh

13、at _ if he _ late?16. 如果努力學(xué)習(xí)，你就會(huì)取得好成績(jī)。If you_ _, you _ good _.17. 他如果看電視太久了，他的父母會(huì)不高興。  If he _ TV too much, his parents _ _ unhappy.18. 如果我們?yōu)樗M織生日聚會(huì)，大家都會(huì)來(lái)的。  Everyone _if we _a birthday party _ him.19. 如果明天不下雨，我會(huì)和你一起去公園的。  If it _  _ tomorrow, I _ go to the park _ you.20. 如果她睡過(guò)頭了

14、，就會(huì)旅游遲到的。  She;_ the trip if she _.21. 如果他有空，他會(huì)幫助你的。If he _, he _  you.22. 如果Tom考試不及格，他就沒(méi)有機(jī)會(huì)上高中了。Tom _have the _to go to the _high school if he _ the exams.23. 你如果抄同學(xué)的作業(yè)就不能學(xué)好各門功課。You _ _ good at all the subjects if you _ the other students homework. .單項(xiàng)選擇1. If you _ to the party, youll hav

15、e a great time. A. will go  B. went  C. go   D. going2. It will be a long time _ Peter _ his work. A. since, has finished   B. after, finishes   C. when, will finish   D. before, finishes.3. What will father _ us from Japan? A. take   B. br

16、ing   C. carry   D. make 4. Weifang is famous _ kites. A. for   B. to   C. on   D. with5 I _ her the answer if she _me. A. can tell, will ask   B. will tell, will ask  C. would tell, ask   D. will tell, asks6. What are you go

17、ing to do tomorrow?  -Well go to the library tomorrow if it _. A. isnt rain  B. rain   C. wont rain  D. doesnt rain7.Do you know when he will come back tomorrow?-Sorry, I dont know. When he _ back, Ill tell you. A. comes  B. will come   C. come   D.

18、may come 8. What will you do if you _ to the old folks home visit?A. go   B. went   C. going   D. will go9. If I eat _ food, Ill be very fat.A. too many   B. many too   C. too much  D. much too10. Ill give the book to him if he _ here next Sunday.A. will come   B. comes   C. is coming    D. came11. There _an English film in our school tomorrow.A. is going to have  B. will have   C. is going to be   D. has12