初中英語——If引導(dǎo)的條件狀語從句

1、if引導(dǎo)的條件狀語從句引導(dǎo)條件狀語從句最常用的連詞是if，常見的if條件狀語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如果你請他幫忙，他會幫你的。 If you fail in the exam，you will let him down如果你考試不及格，你會讓他失望的。 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)。從句多用一般過去時或過去完成時，表示對現(xiàn)在或過去的一種假設(shè)。如： If I were you，I would invite him to the party如果我是你，我會邀請他參加聚會。 I would have arrived much earlier if I had not been caught in the traffic要不是交通堵塞，我本會來得早一些。另外你還要注意if 條件句的時態(tài)搭配1if從句用一般現(xiàn)在時，主句用一般將來時 If he runs hell get there in time. 如果他用跑的，他就會及時趕到那兒。The cat will scratch

3、 you if you pull her tail. 如果你拉貓的尾巴，它就會抓你。2if從句用一般現(xiàn)在時，主句用may/might/canIf the fog gets thicker the plane may/might be diverted. 如果霧在大一些，飛機可能就會改在別的機場降落。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，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，主句用一般現(xiàn)在時If you heat ice it turns to water. (也可用will turn)如果把冰加熱，它就會化成水。5if從句用現(xiàn)在進行時，主句用一般將來時If you are looking for Peter youll find him upstairs. 如果你是在找彼得，上樓就會找到他。6if從句用現(xiàn)在完成時，主句用一般將來時If you have finished dinner Ill ask the waiter for the bill. 如果你吃完了，我就叫服務(wù)生來算賬注意 ：學(xué)習(xí)" if " 引導(dǎo)的條件狀語

5、從句的用法,現(xiàn)在總結(jié)一下: if 條件句不一般,幾個要點記心間; 條件句,放在前,逗號要放句中間。 條件句表可能，主句多用將來時； 條件句表事實，主句常用現(xiàn)在時。在 if 引導(dǎo)的條件狀語從句中，如果從句談?wù)摰氖且粋€有可能發(fā)生的事實及其產(chǎn)生的相關(guān)的結(jié)果，主句用一般將來時態(tài)，從句用一般現(xiàn)在時態(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)在時態(tài)。如： If bears are in danger ,they attack people.在 if 引導(dǎo)的條件狀語從句中，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，和主句隔開。還要注意前后時態(tài)一致原則if 條件狀語從句的時態(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)，你就會取得好成績。If you_ _, you _ good _.17. 他如果看電視太久了，他的父母會不高興。  If he _ TV too much, his parents _ _ unhappy.18. 如果我們?yōu)樗M織生日聚會，大家都會來的。  Everyone _if we _a birthday party _ him.19. 如果明天不下雨，我會和你一起去公園的。  If it _  _ tomorrow, I _ go to the park _ you.20. 如果她睡過頭了

14、，就會旅游遲到的。  She;_ the trip if she _.21. 如果他有空，他會幫助你的。If he _, he _  you.22. 如果Tom考試不及格，他就沒有機會上高中了。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