Lesson 11 If引導(dǎo)條件狀語從句 人教版英語暑假語法專題教案（七升八）

1、英語暑假教案-七升八-第十一講Lesson 11 If引導(dǎo)條件狀語從句【內(nèi)容提要】If引導(dǎo)條件狀語從句【知識(shí)要點(diǎn)回碩】1從句和if引導(dǎo)的條件狀語從句從句: 在復(fù)合句中不能獨(dú)立成句,但具有主語部分和謂語部分,由if, when, that, who, whom, why, where, how, which等引導(dǎo)詞引導(dǎo),作為主句的某一成分(定語、狀語、賓語等)。if 引導(dǎo)的條件狀語從句:由引導(dǎo)詞if引導(dǎo),表示在某條件下,某事很可能發(fā)生,意為"如果.,就.",整個(gè)句子作為主句的狀語部分,既可放在主句前面,也可放在主句后面。若if 條件狀語從句放在句首,從句后面要加逗號(hào)與主句隔開

2、。如:If I have time, I will visit the museum. 如果我有時(shí)間,我會(huì)去參觀博物館。條件狀語從句 主句= I will visit the museum if I have time.主句 條件狀語從句2 if引導(dǎo)的條件狀語從句時(shí)態(tài)的運(yùn)用主句時(shí)態(tài)從句時(shí)態(tài)例句一般現(xiàn)在時(shí)一般現(xiàn)在時(shí)If you heat ice, it turns to water.如果你把冰加熱,它就會(huì)化成水。一般將來時(shí)一般現(xiàn)在時(shí)If he runs, he'll get there in time.如果他跑過去,他可以及時(shí)趕到那兒。含有may/ might/ can/ must /s

3、hould等情態(tài)動(dòng)詞的句子一般現(xiàn)在時(shí)If you want to lose weight, you must eat less bread.如果你想減肥,你必須少吃面包。祈使句一般現(xiàn)在時(shí)Open the door if you feel very hot.如果你覺得很熱就開門。3 if引導(dǎo)的條件狀語從句的句型轉(zhuǎn)換含有if引導(dǎo)的條件狀語從句的主從復(fù)合句,一般可以轉(zhuǎn)化為同義單句。1. 借助 "祈使句+and/or+句子(一般將來時(shí)結(jié)構(gòu))"來轉(zhuǎn)化。其中,在句意上and表示順;or表示轉(zhuǎn)折,意為“否則”。如:If you study hard, you'll pass th

4、e exam easily. 如果你努力學(xué)習(xí),你將很容易通過考試。= Study hard, and you'll pass the exam easily.= Study hard, or you won't pass the exam easily.2. 借助without或with來轉(zhuǎn)換。如:If there is no water, fish will die. 如果沒有水,魚就會(huì)死。= Fish will die without water.If you help me, I'll finish the work soon. 如果你幫助我,我將很快完成工作。=

5、With your help, I'll finish the work soon.【考點(diǎn)突破】例1根據(jù)漢語意思把句子補(bǔ)充完整 如果雪停了,我們就可以出去。If it snowing, we go out.講解 本題考查if引導(dǎo)的條件狀語從句的用法。從句的時(shí)態(tài),要看主句的時(shí)態(tài)。從“我們就可以出去” 可知,此處應(yīng)該用 can。 當(dāng)主句中含有情態(tài)動(dòng)詞時(shí),從句用一般現(xiàn)在時(shí)。答案 stops can例2 If the weather fine, we have a sports meeting this weekend.A. will be; willB. is; willC. was; wo

6、uld講解 本題考查f引導(dǎo)的條件狀語從句。在含有f引導(dǎo)的條件狀語從句的主從復(fù)合句中,由this weekend 可判斷主句用一般將來時(shí),從句則用一般現(xiàn)在時(shí)。 答案 B例3將下面的句子轉(zhuǎn)換為兩個(gè)意思相同的句子You'll be late if you don't hurry up. (1) Hurry up, you'll be late.(2) You'll be late you hurry up.講解 本題考查if引導(dǎo)的條件狀語從句的句型轉(zhuǎn)換。句意:如果你不快點(diǎn)兒,你就會(huì)遲到。與這個(gè)句子意思相同的有:快點(diǎn)兒,否則 (不然)你會(huì)遲到; 你將要遲到,除非你快點(diǎn)兒

7、。 前者可借助“or+一般將來時(shí)結(jié)構(gòu)”進(jìn)行轉(zhuǎn)換;后者可以用“unless+其他”進(jìn)行轉(zhuǎn)換。 答案 (1) or(2) unless【知識(shí)點(diǎn)撥】unless引導(dǎo)的條件狀語從句與if引導(dǎo)的條件狀語從句unless 意為“除非,否則”,相當(dāng)于if not。unless引導(dǎo)的條件狀語從句也可以用or“否則”來做同義句轉(zhuǎn)換。如:Unless you listen carefully, you won't know the answer.除非你認(rèn)真聽,否則你不知道答案。= If you don't listen carefully, you won't know the answe

8、r.= Listen carefully, or you won't know the answer.【試題研究】一、單項(xiàng)選擇(B) 1. If you want to go alone, I will go with you.A. won'tB. don'tC. doesn't(B) 2. Don't wait for me if I late.A. will beB. amC. was(C) 3. If the snow heavier, the shop may be closed.A. will get B. get C. gets(C) 4.

9、If we put ice into fire, it .A. will meltB. meltC. melts(A) 5. I want to know you have a brother.A. ifB. thatC. unless(B) 6. If we attention to the earth, we'll have a better world.A. pay muchB. pay moreC. paid more(A) 7. If it tomorrow, what shall we do?A. rainsB. rainC. raining(C) 8. I her the

10、 answer if she me.A. can tell; will ask B. will tell; will askC. will tell; asks(A) 9. What will you do if you to the old folk's home?A. goB. will goC. going(A) 10. If there fewer trees, there more pollution.A. are; will be B. were; will beC. are; won't be (C) 11. If I eat food, I'll be

11、very fat.A. too manyB. much tooC. too much(B) 12. If the fog gets thinner, the plane be landed(降落).A. mayB. canC. should(B) 13. If she , she won't be sorry.A. comeB. comesC. came(C) 14. If you the coat, you'll find it on your bed.A. are looking for B. were looking forC. look for(A) 15. Lana

12、a new dress if the old one out of style.A .will buy; isB. will buy; wasC. buys; is(A) 16. If you wish, you come in and have a cup of coffee.A. mayB. mustC. would(B) 17. Maybe you if you make some bad friends.A. go wrongB. will go wrongC. going wrong(A) 18. - Can you tell me if it tomorrow?- I'm

13、not sure, I will go swimming if it tomorrow.A. will rain; doesn't rainB. will come; won'tC. rains; will rain(A) 19. - Come and join us, Betty!- I'm afraid I can't. I'm too busy now. If I time, I would certainly go.A. haveB. have hadC. will have (B) 20. In the zoo if a child into

14、the water and can't swim, the dolphins may come up him.A. will fall; to helpB. falls; to helpC. will fall; help二、根據(jù)中文提示完成下列句子 21. 他如果看電視太久了,他的父母會(huì)不高興。If he watches TV too much, his parents will be unhappy.22. 如果我們?yōu)樗M織一場(chǎng)聚會(huì),大家都會(huì)前來的。Everyone will come if we hold a party for him.23. 如果你抄同學(xué)的作業(yè),就不能學(xué)好各門

15、功課。You wont be good at all the subjects if you copy the other classmates' homework.24. 如果你對(duì)這個(gè)俱樂部感興趣,請(qǐng)?zhí)顚戇@張申請(qǐng)表。If you are interested in this club, please fill in this application form.25. 如果你現(xiàn)在不出發(fā),就會(huì)錯(cuò)過末班車。 If you don't leave now, you will miss the final bus.三、單句改錯(cuò)(下列各句中均有一處錯(cuò)誤,請(qǐng)找出并改正)26. What i

16、s going to happen if there is no air? is going towill 27. If you will want to lose weight, you must eat less meat. 去掉will 28. If necessary, I can came at once. came come 29. If you have some questions to ask, please call me. someany 30. I can't decide if I will go to see the movie. ifwhether 四、按

17、要求改寫句子31. You can pass the exam if you work hard. .(同義句轉(zhuǎn)換) Work hard , and you can pass the exam .32. If you don't hurry up, you will be late again. (同義句轉(zhuǎn)換) Hurry up , or you will be late again .33. If you help Nancy, she will work faster. (同義句轉(zhuǎn)換)With your help , Nancy will work faster .34. Was

18、the machine invented by Tom? She wasn't sure. (合并成一句話) She wasnt sure whether the machine was invented by Tom .五、首字母填空。根據(jù)句意及首字母提示,完成單詞。1. Mrs. Black spoke so fast that I couldn't follow her.2. Don't read in the sun, because it's bad for your eyes.3. You're walking too slowly. Com

19、e on, or you will be late for class.4. Luckily, the lost child was found and his parents were happy and excited.5. This dictionary is really cheap and good. Our teacher advises us to buy it.6. Tina bought some gifts for her friends when she was on trip in New York.7. The old man can't hear us, b

20、ecause there is something wrong with his ears.8. Many children are interested in robots in our school and they want to have robot classes.9. It is 7:10 pm. Look at the sky. It's getting dark. Come on. Let's go home right now.10. The soccer game between China and Japan was exciting last night

21、 and many young people stayed up late to watch it on TV.六、閱讀下面短文,根據(jù)短文內(nèi)容判斷句子的正誤。正確的填"A",錯(cuò)誤的填"B"。My father is a driver and my mother is a teacher. Both of them work hard during the week. And they are very busy. But they took me to visit my uncle last weekend. We enjoyed ourselves a

22、t my uncle's home.My uncle had a farm. It was not very big, but there was always so much to do on the farm, so we helped to work on the farm. I like looking after the animals, taking them to the field, giving them food and playing with them.My parents helped my uncle in the field, and my aunt prepared(準(zhǔn)備) dinner for us. Sometimes I helped in the field, too. It was on the farm that I got to know the meaning of the saying, "A grain, a sweat.(一分耕耘,一分收獲.)" After several hours' hard work, we were all hungry and tired. We