if引導的條件狀語從句講解和練習答案(共5頁)

1、精選優(yōu)質(zhì)文檔-傾情為你奉上條件狀語從句一、 條件狀語從句通常由if（如果）, unless（除非），as long as（只要）引導。例如：If it rains tomorrow, we wont go to the park. 如果明天下雨，我們就不去公園了。 Unless weather stops me, I go for a walk every. 我每天都會去散步，除非遇上壞天氣。 Our parents will be pleased with our performance as long as we try our best.小試牛刀：1、只要我們竭盡全力，父母就會滿意我們的

2、表現(xiàn)。 Our parents will be pleased with our performance _ _ _ we try our best.2、如果人人為保護環(huán)境做出貢獻，世界將會變得更美好。_ _ _ _ _ to protecting the environment, the world will become much more beautiful.二、if引導的條件狀語從句（1）“if從句+祈使句”的句子。其實，if作為一個連詞，主句也可以是其他形式的句子。例如：If you want to go, please let me know. If the green light

3、 isnt on, wait for a minute.(2)“祈使句 + and (or)+ 陳述句” 在意思上相當于一個帶有條件狀語從句的復合句。注意：A. “祈使句 + and + 陳述句”可以轉(zhuǎn)化為if引導的肯定條件狀語從句，而且主語是第二人稱。B. “祈使句 + or + 陳述句”可以轉(zhuǎn)化為if引導的否定條件狀語從句，而且主語是第二人稱。例如：Study hard and you will pass the exam. =If you study hard, you will pass the exam. Hurry up, or youll be late. =If you don

4、t hurry up, youll be late.考題(2010重慶中考)Work hard，_ you may catch up with your classmates soon.A.orB.butC.andD.yet思路解析：本句是“祈使句and”的句型，句意為“努力學習，你會很快趕上其他同學的”，and在句中表示承接關(guān)系，所以選C項。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

5、you will have a good rest. 2、Hurry up, or youll miss the bus. 三、if從句與主句具有以下特點：1If從句中用一般現(xiàn)在時，表示未來的一種條件，從句中可以加時間狀語。e.g.If you cant come tomorrow, we can hold the party a little later.明天你如果不能來，我們可遲一點舉行宴會。If it doesnt rain tomorrow, well go to the Great Wall. 明天如果不下雨，我們就去長城。2當if表示未來的條件時，主句中用一般將來時，從句用一般現(xiàn)在

6、時，即“主將從現(xiàn)”。表示如果某種條件存在，就有可能/不可能發(fā)生什么事情。e.g.If you dont get up early, you will be late for school.你如果不早點起床，上學就會遲到。If I play games on it, it will go wrong. 如果我用它玩游戲，它就會壞掉。3if從句可放在主句前或主句后，從句置于主句前時，須用逗號與主句隔開，反之則不用逗號。e.g.If its fine tomorrow, we can go out. 如果明天天氣好，我們就能出去。She will be happy if she joins the

7、party. 如果她參加聚會她會很開心的。Ill ask the teacher for help if I dont understand. 如果我不懂我會求助老師的。 三注意if引導的條件狀語從句和賓語從句的區(qū)別 if可以用來引導賓語從句也可以用來引導條件狀語從句，主要是要弄清if引導從句的時態(tài)。if在引導賓語從句時，意為“是否”。要根據(jù)實際情況來確定時態(tài)，而if在引導條件狀語從句時意為“如果，假設”，要用一般時代替將來時，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到這兒來。（if在上句引導的是賓語從

8、句，從句中有很明顯的表將來的時間狀語tomorrow，所以if從句要用一般將來時。）e.g.If it rains tomorrow, well put off the sports meeting.如果明天下雨，我們就推遲運動會。（if在上句引導的是條件狀語從句，盡管從句中也有表將來時的時間狀語tomorrow，從理論上講也應該用一般將來時，但是在if引導的條件狀語從句中要用一般現(xiàn)在時代替一般將來時，故從句謂語用rains而不用will rain. ）二、典題分析1、（2010上海）We will have no water to drink we dont protect the eart

9、h. A. until B. before C. though D. if 答案D解析 if 引導條件狀語從句，表示 “如果”。意思是如果我們不保護地球，我們將會沒有水喝。2、（2011 重慶）We will plant trees tomorrow, and I dont know Tom will come and join us. A. if B. which C. what D. where答案A解析 if 引導賓語從句，表示 “是否 ”。意思是我們明天將會去植樹，但是我不知道Tom會不會去。3、Do you know if finished the work? Not yet. If

10、 he , he will give me a call. A. hes, will finish B. hell, finishes C. hes , finishes D. hell , will finish答案C解析問句的 if 引導賓語從句，表示 “是否 ”，從句要用陳述語序，從答句Not yet.中可以看出從句應該用現(xiàn)在完成時態(tài)，答句的if 引導狀語從句，要遵循主將從現(xiàn)的規(guī)律。練習一、用if 連接下面的句子：1、 You do not understand the article. Ask your teacher. 2、 You want to know more about i

11、t. Please call your teacher. 3、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if引導的條件狀語從句。1、 be tired, have a rest (Tom) 2、 not go to bed early, feel sleepy (you) 3、 become unhealthy, no

12、t eat vegetables (children) 4、 not listen to the teacher, not study well (I ) 5、 fall behind others in studying, spend too much time on the games (Da Wei) 三、單項選擇：1. You are sure to pass the exam _ you study hard.A. if B. though C. that D. since2. I'll go to see the film with you_I have time this

13、 evening.A. whether B. so C. if D. when3. _ you study harder, you'll never pass the final exam.A. If B. Until C. Unless D. Except4Well stay at home if it _ this afternoon. Arain Brains Cto rain Draining 5We will go to the Great Wall if it _tomorrow. Awont rain Bisnt raining Crained Ddoesnt rain

14、6 I dont know if he _. He will come if it _. Acomes; wont rain Bwill come; doesnt rain Ccomes; doesn't rain Dwill come; wont rain 7Do you know what time _？ Athe train leave Bdoes the train leave Cwill the train leave Dthe train leaves 8Do you think if_ an English film tomorrow night？ Ais there B

15、there is going to have Cthere is going to be Dwill there be 9Will you please tell me _？ Awhere Pudong Airport is Bhow far Pudong Airport was Chow can we get to Pudong Airport Dwhen was Pudong Airport built 10Mike wants to know if_ a picnic tomorrow. Yes. But if it _, well visit the museum instead. A

16、you have; will rain Byou will have; will rain Cyou will have; rains Dwill you have; rains 11 Why didnt Nick come to school yesterday？ _ he was ill. AAfter BWhere CWhen DBecause 12This box is _ heavy _ I cant carry it. Atoo; to Bso; that Cvery; that Dtoo; that 13I dont know _ he still lives here. Awh

17、ere Bwhat Cwhen Dwhether 14. -Do you know if he _ to play basket ball with us? -I think he will come if he _ free tomorrow. A. comes; is B. comes; will be C. will come; is D. will come; will be15. In the zoo if a child _ into the water and cant swim, the dolphins may come up _ him. A. will fall; to

18、help B. falls; to help C. will fall; help D. falls; helping16.In 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 if you make some