初中英語(yǔ)初一-if條件句

if條件句【知識(shí)要點(diǎn)】定義：常見(jiàn)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。 E.g. If you ask him，he will help you如果你請(qǐng)他幫忙，他會(huì)幫你的。 E.g. 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。 E.g. 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)。E.g.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)。 E.g.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) E.g. 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。E.g. The cat will scratch 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/canE.g. If 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。E.g. 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/shouldE.g. If you want to lose weight you must/should eat less bread. 如果你想減肥，你必須少吃面包。4if從句用一般現(xiàn)在時(shí)，主句用一般現(xiàn)在時(shí)E.g. 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)E.g. 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)E.g. 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)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： E.g. We can walk there if we cant find a bus . E.g. If it rains tomorrow ,we will not go to the zoo. E.g. What will you do if you find a panda in danger.如果 if 條件句談?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)。 E.g. 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【經(jīng)典練習(xí)】用所給詞的適當(dāng)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) 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 _(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. _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.翻譯句子1.如果他到的晚了會(huì)發(fā)生什么事情？What _ if he _ late?2. 如果努力學(xué)習(xí)，你就會(huì)取得好成績(jī)。If you_ _, you _ good _.3. 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.4. 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.5. 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.6. 如果她睡過(guò)頭了，就會(huì)旅游遲到的。She_ the trip if she _.7. 如果他有空，他會(huì)幫助你的。If he _, he _ you.8. 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.一般將來(lái)時(shí)專項(xiàng)練習(xí)一、單項(xiàng)選擇( ) 1. There _ a meeting tomorrow afternoon.A. will be going toB. will going to be C. is going to beD. will go to be( ) 2. Charlie _ here next month.A. isnt workingB. doesnt working C. isnt going to workingD. wont work( ) 3. He _ very busy this week, he _ free next week.A. will be; isB. is; is C. will be; will be D. is; will be( ) 4. There _ a dolphin show in the zoo tomorrow evening.A. wasB. is going to have C. will haveD. is going to be( ) 5. _ you _ free tomorrow? No. I _ free the day after tomorrow.A. Are; going to; will B. Are; going to be; will C. Are; going to; will be D. Are; going to be; will be( ) 6. Mother _ me a nice present on my next birthday. A. will gives B. will give C. givesD. give( ) 7. Shall I buy a cup of tea for you? _. （不，不要。）A. No, you wont.B. No, you arent. C. No, please dont.D. No, please.( ) 8. Where is the morning paper? I _ if for you at once. A. get B. am getting C. to get D. will get( ) 9. _ a concert next Saturday?A. There will be B. Will there be C. There can be D. There are( ) 10. If they come, we _ a meeting. A. have B. will have C. had D. would have( ) 11. He _ her a beautiful hat on her next birthday.A. gives B. gave C. will giving D. is going to giving( ) 12. He _ to us as soon as he gets there. A. writes B. has written C. will write D. wrote( ) 13. He _ in three days.A. coming backB. came back C. will come back D. is going to coming back( ) 14. If it _ tomorrow, well go roller-skating.A. isnt rain B. wont rain C. doesnt rain D. doesnt fine( ) 15. Will his parents go to see the Terra Cotta Warriors tomorrow? No, _ （不去）. A. they willnt. B. they wont. C. they arent. D. they dont.( ) 16. Who _ we _ swimming with tomorrow afternoon? A. will; go B. do; go C. will; going D. shall; go( ) 17. We _ the work this way next time. A. do B. will do C. going to do D. will doing( ) 18. Tomorrow he _ a kite in the open air first, and then _ boating in the park.A. will fly; will go B. will fly; goes C. is going to fly; will goes D. flies; will go( ) 19. The day after tomorrow they _ a volleyball match.A. will watching B. watches C. is watching D. is going to watch( ) 20. There _ a birthday party this Sunday. A. shall be B. will be C. shall going to be D. will going to be( ) 21. They _ an English evening next Sunday.A. are having B. are going to have C. will havingD. is going to have( ) 22. _ you _ free next Sunday?A. Will; are B. Will; be C. Do; beD. Are; be( ) 23. He _ there at ten tomorrow morning. A. will B. is C. will be D. be( ) 24. _ your brother _ a magazine from the library? A. Are; going to borrow B. Is; going to borrow C. Will; borrows D. Are; going to borrows( ) 25. Shall I come again tomorrow afternoon? _ （好的）. A. Yes, please B. Yes, you will. C. No, please. D. No, you wont.( ) 26. It _ the year of the horse next year.A. is going to be B. is going to C. will be D. will is( ) 27. _ open the window?A. Will you please B. Please will you C. You please D. Do you ( ) 28. Lets go out to play football, shall we? OK. I _.A. will comingB. be going to come C. come D. am coming( ) 29. It _ us a long time to learn English well. A. takes B. will take C. spends D. will spend( ) 30. The train _ at 11. A. going to arrive B. will be arrive C. is going to D. is arriving二、動(dòng)詞填空。1. I _（leave）in a