if引导的条件状语从句中考解析

if引导的条件状语从句中考解析

If引导的条件状语从句 ‎[课本链接] ‎ If you do, you’ll be sorry. (Unit 5, Section A)‎ ‎[定义] ‎ 条件状语从句通常由if（如果），unless（除非），as long as（只要）引导。‎ if引导的条件状语从句表示假如从句的动作发生，主句的动作就（不）会发生。‎ ‎[句子结构]‎ 中考考点之 [时态呼应] ‎ 在复合句中：‎ ‎ ⑴ 当主句是一般现在时或是一般将来时时；‎ （2） 当主句是祈使句时；‎ ‎（3）当主句含有情态动词时，if引导的条件状语从句通常用一般现在时。如：‎ 例句：‎ If she doesn’t come, she will be sorry. 如果她不来，她会遗憾的。‎ Have a good rest if you are tired. 如果累了，你就好好休息一下。‎ We must study hard if we want to pass the final exam. 如果想通过期末考试，我们必须努力学习。‎ ‎[同义句转换] ‎ ‎1. If引导的条件状语从句可以用“祈使句， ＋ and / or ＋ 一般将来时的句子”转换。‎ ‎ 祈使句,+and+陈述句可以转化为if 引导的肯定条件状语从句。‎ ‎ 祈使句,+or+陈述句可以转化为if 引导的否定条件状语从句。如：‎ If you work hard, you’ll pass the exam easily. → Work hard, and you’ll pass the exam easily. 努力学习，你将很容易通过考试。‎ If you don’t hurry up, you’ll miss the train. → Hurry up, or you’ll miss the train. 快点儿，否则你就赶不上火车了。 ‎ 真题　(2010重庆中考)Work hard，________ you may catch up with your classmates soon.‎ A.or B.but C.and D.yet 课后练习：用if连接下列句子 ‎1、Go to bed early， and you will have a good rest. ‎ ‎ ‎ ‎2、Hurry up, or you’ll miss the bus.‎ ‎ ‎ ‎2. 用含介词with或without的介词短语转换。如：‎ If there is no water, fish can’t live. → Fish can’t live without water. 离开水，鱼不能生存。‎ ‎[if引导的条件状语从句和宾语从句的区别]‎ ‎ ‎ if可以用来引导宾语从句也可以用来引导条件状语从句，主要是要弄清if引导从句的时态。‎ if在引导宾语从句时，意为“是否”。要根据实际情况来确定时态，并且一般将来时用will+ V.原形；‎ 而if在引导条件状语从句时意为“如果，假设”，要用一般时代替将来时，即“主将从现”。‎ e.g.I want to know if he will come here tomorrow.我想知道他明天是否到这儿来。‎ ‎（if在上句引导的是宾语从句，从句中有很明显的表将来的时间状语tomorrow，所以if从句要用一般将来时。）‎ e.g.If it rains tomorrow, we’ll put off the sports meeting.如果明天下雨，我们就推迟运动会。‎ ‎（if在上句引导的是条件状语从句，尽管从句中也有表将来时的时间状语tomorrow，从理论上讲也应该用一般将来时，但是在if引导的条件状语从句中要用一般现在时代替一般将来时，故从句谓语用rains而不用will rain. ）‎ 典题分析 ‎1、（2010上海）We will have no water to drink we don’t protect the earth.‎ ‎ A. until B. before C. though D. if ‎ ‎2、（2011 重庆）We will plant trees tomorrow, and I don’t know Tom will come and join us.‎ ‎ A. if B. which C. what D. where ‎3、—Do you know if finished the work? —Not yet. If he , he will give me a call.‎ ‎ A. he’s, will finish B. he’ll, finishes ‎ ‎ C. he’s , finishes D. he’ll , will finish Homework 一、用if 连接下面的句子：‎ 1、 You do not understand the article. Ask your teacher.‎ ‎ ‎ 2、 You want to know more about it. 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、用所给的提示词组成一个if引导的条件状语从句。‎ 1、 be tired, have a rest (Tom)‎ ‎ ‎ 2、 not go to bed early, feel sleepy (you)‎ ‎ ‎ 3、 become unhealthy, not 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、单项选择：‎ ‎1. You are sure to pass the exam ___ you study hard. A. if B. though C. that D. since ‎2. I'll go to see the film with you___I have time this evening. A. whether B. so C. if D. when ‎3. ___ you study harder, you'll never pass the final exam. A. If B. Until C. Unless D. Except ‎4．We’ll stay at home if it ______ this afternoon.‎ ‎ A．rain　　　 B．rains C．to rain　　 D．raining ‎ ‎5．We will go to the Great Wall if it ______tomorrow. ‎ ‎ A．won’t rain B．isn’t raining C．rained　　 D．doesn’t rain ‎ 6． ‎—I don’t know if he ______.‎ ‎ —He will come if it ______.‎ ‎ A．comes; won’t rain　　　　　　　　 B．will come; doesn’t rain ‎ ‎ C．comes; doesn't rain　　　　　　　 D．will come; won’t rain ‎ ‎7．Do you know what time ______？‎ ‎ A．the train leave　　　　　　　　　 B．does the train leave ‎ ‎ C．will the train leave　　　　　　 　 D．the train leaves ‎ ‎8．Do you think if______ an English film tomorrow night？‎ ‎ A．is there　　　　　　　　　　　　　 B．there is going to have ‎ ‎ C．there is going to be　　　　　　　 D．will there be ‎ ‎9．Will you please tell me ______？‎ ‎ A．where Pudong Airport is B．how far Pudong Airport was ‎ ‎ C．how can we get to Pudong Airport D．when was Pudong Airport built ‎ ‎10．—Mike wants to know if______ a picnic tomorrow.‎ ‎ —Yes. But if it ______, we’ll visit the museum instead. ‎ ‎ A．you have; will rain　　　　　　　 B．you will have; will rain ‎ ‎ C．you will have; rains　　　　　　　 D．will you have; rains ‎ 11． ‎—Why didn’t Nick come to school yesterday？‎ ‎ —______ he was ill. ‎ ‎ A．After　　　　 B．Where C．When　　　　 D．Because ‎ ‎12．This box is ______ heavy ______ I can’t carry it.‎ ‎ A．too; to　　　 B．so; that C．very; that　　 D．too; that ‎ ‎13．I don’t know ______ he still lives here.‎ ‎ A．where　　　 B．what C．when　　　 D．whether ‎ ‎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 be ‎15. In the zoo if a child _____ into the water and can’t swim, the dolphins may come up ______ him.‎ ‎ A. will fall; to help B. falls; to help C. will fall; help D. falls; helping ‎16.In the bookshop，a reader asked the shop keeper ___Who Moved My Cheese was an interesting book.‎ A.that B.how C.what D.if ‎17、I want to know ________ you have a brother.‎ ‎　　A.if B.that C.those D.them ‎ ‎18、We will go hiking if it tomorrow.‎ ‎ A.will be fine B.is fine C.be fine D. is gong to be fine ‎19、Maybe you if you make some bad friends. ‎ ‎ A.go wrong B. will go wrong C.going wrong D. is going to be wrong 20、 ‎—Do you know if finished the work? ‎ ‎ —Not yet. If he , he will give me a call.‎ ‎ A. he’s, will finish B. he’ll, finishes C. he’s , finishes D. he’ll , will finish