if引導(dǎo)的條件狀語(yǔ)從句講解和練習(xí)(答案)

1、條件狀語(yǔ)從句條件狀語(yǔ)從句通常由 if （如果）,unless （除非），as long as （只要）引導(dǎo)例如：If it rains tomorrow, we won go to the park. 女口果明天下雨，我們就不去公園了。Uni ess weather stops me, I go for a walk every.我每天都會(huì)去散步，除非遇上壞天氣。Our pare nts will be pleased with our performa nee as long as we try our best.小試牛刀：1、只要我們竭盡全力，父母就會(huì)滿意我們的表現(xiàn)。Our pare nt

2、s will be pleased with our performa nee_ we try our best.2、如果人人為保護(hù)環(huán)境做出貢獻(xiàn)，世界將會(huì)變得更美好。_ to proteeti ngthe environment, the world will become much more beautiful.二、if 引導(dǎo)的條件狀語(yǔ)從句（1） “i 從句+祈使句”勺句子。其實(shí)，if 作為一個(gè)連詞，主句也可以是其他形式的句子。 例如：If you want to go, pleaselet me know.If the gree n light is n ton, wait for a m

3、inute.祈使句+ and （or）+ 陳述句”在意思上相當(dāng)于一個(gè)帶有條件狀語(yǔ)從句的復(fù)合句。注意：A.祈使句+ and +陳述句”可以轉(zhuǎn)化為 if 引導(dǎo)的肯定條件狀語(yǔ)從句，而且主語(yǔ)是第二人稱(chēng)。B.祈使句+ or +陳述句”可以轉(zhuǎn)化為 if 引導(dǎo)的否定條件狀語(yǔ)從句，而且主語(yǔ)是第二人稱(chēng)。例如： Study hard and you will pass the exam. =If you study hard, you will pass the exam.Hurry up, or you ll be late. =If you don t hurry up, you ll be late.考題（

4、2010 重慶中考）Work hard , _ you may eateh up with your classmates soon.A.orB.butC.a ndD.yet思路解析：本句是 祈使句+ and”的句型，句意為 努力學(xué)習(xí)，你會(huì)很快趕上其他同學(xué)的”，and 在句中表示承接關(guān)系，所以選 C 項(xiàng)。答案：C黑色陷阱：本題的陷阱是句型，本句型區(qū)別于祈使句+ or”，這個(gè)句型的含義是“；不然的話/否則”。綠色通道：祈使句后面既可以加 and，也可以加 or，所以要全面分析句意，再作決定。小試牛刀：用 if 連接下列句子1、Go to bed early and you will have a

5、 good rest.2、Hurry up, or you ll miss the bus.三、if 從句與主句具有以下特點(diǎn)：1.If 從句中用一般現(xiàn)在時(shí)；表示未來(lái)的一種條件，從句中可以加時(shí)間狀語(yǔ)。e.g.If you can t eome tomorrow, we can hold the party a little later.明天你如果不能來(lái)，我們可遲一點(diǎn)舉行宴會(huì)。If it doesn t rain tomorrow, we ll go to the Great W 天如果不下雨，我們就去長(zhǎng)城。2 .當(dāng) if 表示未來(lái)的條件時(shí)，主句中用一般將來(lái)時(shí)，從句用一般現(xiàn)在時(shí)，即“主將 _。表示

6、如果某種條件存在，就有可能/不可能發(fā)生什么事情。e.g.If you don t get up early, you will be late for school.你如果不早點(diǎn)起床，上學(xué)就會(huì)遲至 U。If I play games on it, it will go wron g.如果我用它玩游戲，它就會(huì)壞掉。3 . if 從句可放在主句前或主句后，從句置于主句前時(shí)，須用逗號(hào)與主句隔開(kāi)，反之則不用逗號(hào)。e.g.If it s fine tomorrow, we can go out. 女口果明天天氣好，我們就能出去。She will be happy if she joi ns the pa

7、rty.如果她參加聚會(huì)她會(huì)很開(kāi)心的。I ll ask the teacher for help if I don t ur 如果我不懂我會(huì)求助老師的。三.注意 if 引導(dǎo)的條件狀語(yǔ)從句和賓語(yǔ)從句的區(qū)別if 可以用來(lái)引導(dǎo)賓語(yǔ)從句也可以用來(lái)引導(dǎo)條件狀語(yǔ)從句，主要是要弄清if 引導(dǎo)從句的時(shí)態(tài)。if 在引導(dǎo)賓語(yǔ)從句時(shí)，意為“是否”。要根據(jù)實(shí)際情況來(lái)確定時(shí)態(tài)，而if 在引導(dǎo)條件狀語(yǔ)從句時(shí)意為“如果，假設(shè)”，要用一般時(shí)代替將來(lái)時(shí)，即“主將從現(xiàn)”。e.g .I want to know if he will come here tomorrow.我想知道他明天是否至 U 這兒來(lái)。（if 在上句引導(dǎo)的是賓語(yǔ)從

8、句，從句中有很明顯的表將來(lái)的時(shí)間狀語(yǔ)tomorrow，所以 if 從句要用一般將來(lái)時(shí)。）e.g.If it rains tomorrow, we ll put off the sports meeting.女口果明天下雨，我們就推遲運(yùn)動(dòng)會(huì)。（if 在上句引導(dǎo)的是條件狀語(yǔ)從句，盡管從句中也有表將來(lái)時(shí)的時(shí)間狀語(yǔ)tomorrow，從理論上講也應(yīng)該用一般將來(lái)時(shí)，但是在 if 引導(dǎo)的條件狀語(yǔ)從句中要用一般現(xiàn)在時(shí)代替一般將來(lái)時(shí)，故從句謂語(yǔ)用 rains 而不用 will rain.）二、典題分析1、（2010 上海）We will have no water to drink _ we don prote

9、ct the earth.A. un tilB. beforeC. thoughD. if答案D .解析if 引導(dǎo)條件狀語(yǔ)從句，表示“如果”。意思是如果我們不保護(hù)地球，我們將會(huì)沒(méi)有水喝。2、 （2011 重慶）We will plant trees tomorrow, and I dontknow _ Tom will come and join us.A. if B. which C. whatD. where答案A .解析if 引導(dǎo)賓語(yǔ)從句，表示“是否”。意思是我們明天將會(huì)去植樹(shù)，但是我不知道Tom 會(huì)不會(huì)去。3、 一 Do you know if _ finished the work?

10、 Not yet. If he _, he will give me a call.A. he will finishB. he finishesC. he , finishesD. he ll, will finish答案C .解析問(wèn)句的 if 引導(dǎo)賓語(yǔ)從句，表示“是否”，從句要用陳述語(yǔ)序，從答句N(xiāo)ot yet.中可以看出從句應(yīng)該用現(xiàn)在完成時(shí)態(tài)，答句的if 引導(dǎo)狀語(yǔ)從句，要遵循主將從現(xiàn)的規(guī)律。練習(xí)一、用 if 連接下面的句子:1、 You do not un dersta nd the article. Ask your teacher.2、 You want to know more ab

11、out it. Please call your teacher.C . will the train leaveD . the train leaves3、Tell him to make a phone call to me. He will come here tomorrow.4、You want to go. Please tell me.5、Look at our website. The camera does not work.二、用所給的提示詞組成一個(gè)if 引導(dǎo)的條件狀語(yǔ)從句。1、 be tired, have a rest (Tom)2、 not go to bed ear

12、ly, feel sleepy (you)3、 become un healthy, not eat vegetables(childre n)4、 no t liste n to the teacher, not study well(I )5、fall behi nd others in study ing, spe nd too much time on the games(Da Wei)、單項(xiàng)選擇:1. You are sure to pass the exam_you study hard.A. if B. though C. that D. since2. Ill go to se

13、e the film with you_I have time this eve ning.A. whether B. so C. if D. whe n3._ you study harder, youll never pass the final exam.A. If B. Un tilC. Un less D. Except4 . We ll stay at home if it_this after noon.A. rainB. rains C. to rainD. raining5 . We will go to the Great Wall if it_ tomorrow.A. w

14、on t rain B . isn t raining6 . I don t know if he_ .He will come if it_ .A . comes; won t rainC . comes; does nt rain7 . Do you know what time_?A . the train leaveC . rained D . doesn t rainB . will come; doesn t rainD . will come; won t rainB . does the train leave8 . Do you think if_ an English fi

15、lm tomorrow night?A.is thereB.there is going to haveC .there is going to beD. will there be9. Will you please tell me?A. where Pudong Airport isB . how far Pudong Airport wasC .how can we get to Pudong AirportD . when was Pudong Airport built10.Mike wants to know ifa picnic tomorrow.Yes. But if it_

16、, we ll visit the museum in stead.A.you have; will rainB.you will have; will rainC.you will have; rainsD.will you have; rains11 .Why didn t Nick come to school yesterday ?_ he was ill.A. AfterB.WhereC.WhenD . Because12 . This box isheavy1 cant carry it.A. too; toB.so; thatC .very; thatD . too; that1

17、3 . I don t knowhe still lives here.A. whereB.whatC .whe nD . whether14.-Do you know if heto play basket ball with us?-I thi nk he will come if he_free tomorrow.A. comes; isB. comes; will beC. will come; isD. will come; will be15. In the zoo if a child_into the water and can t swim, the dolphins may

18、 come up_ him.A. will fall; to helpB. falls; to helpC. will fall; helpD. falls; helpi ng16n the bookshop , a reader asked the shop keeper_ Who Moved My Cheese was an interesting book.A.thatB.howC.whatD.if17、 I want to know_ you have a brother.A.if B.that C.those D.them18、 We will go hiking if it _ tomorrow.A.will be fine B.is fine C.be fine D. is gong to be fine19、 Maybe you _ i