初中英語初一-if條件句

if條件句【知識要點】定義：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。 E.g. If you ask him，he will help you如果你請他幫忙，他會幫你的。 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從句還表示不可實現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。從句多用一般過去時或過去完成時，表示對現在或過去的一種假設。E.g.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。 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從句用一般現在時，主句用一般將來時 E.g. If he runs hell get there in time. 如果他用跑的，他就會及時趕到那兒。E.g. The cat will scratch you if you pull her tail. 如果你拉貓的尾巴，它就會抓你。2if從句用一般現在時，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，飛機可能就會改在別的機場降落。E.g. If it stops snowing we can go out. 如果雪停了，我們就可以出去。3if從句用一般現在時，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從句用一般現在時，主句用一般現在時E.g. 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從句用現在進行時，主句用一般將來時E.g. 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從句用現在完成時，主句用一般將來時E.g. If you have finished dinner Ill ask the waiter for the bill. 如果你吃完了，我就叫服務生來算賬注意 ：學習 if 引導的條件狀語從句的用法,現在總結一下: 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，主句常用現在時。在 if 引導的條件狀語從句中，如果從句談論的是一個有可能發(fā)生的事實及其產生的相關的結果，主句用一般將來時態(tài)，從句用一般現在時態(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 條件句談論的是重復發(fā)生和預示要發(fā)生的情景和事件，則主從句大多用一般現在時態(tài)。 E.g. If bears are in danger ,they attack people.在 if 引導的條件狀語從句中，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【經典練習】用所給詞的適當形式填空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.如果他到的晚了會發(fā)生什么事情？What _ if he _ late?2. 如果努力學習，你就會取得好成績。If you_ _, you _ good _.3. 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.4. 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.5. 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.6. 如果她睡過頭了，就會旅游遲到的。She_ the trip if she _.7. 如果他有空，他會幫助你的。If he _, he _ you.8. 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.一般將來時專項練習一、單項選擇( ) 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、動詞填空。1. I _（leave）in a