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1、If引导的条件状语从句课本链接 If you do, youll 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： 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 doesnt come, she will be sorry. 如果她不来，她会遗憾的。Have a good
2、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, youll pass the exam easily. Work hard, and youll pass t
3、he exam easily. 努力学习，你将很容易通过考试。If you dont hurry up, youll miss the train. Hurry up, or youll 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.orB.butC.andD.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 youll mis
4、s the bus. 2. 用含介词with或without的介词短语转换。如：If there is no water, fish cant live. Fish cant 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 wil
5、l 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, well 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 h
6、ave no water to drink we dont protect the earth. A. until B. before C. though D. if 2、（2011 重庆）We will plant trees tomorrow, and I dont know Tom will come and join us. A. if B. which C. what D. where3、Do you know if finished the work? Not yet. If he , he will give me a call. A. hes, will finish B. h
7、ell, finishes C. hes , finishes D. hell , will finishHomework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
8、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 t
9、he 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. since2. Ill go to see the film with you_I have time this evening.A. whether B. so C. if D. when3. _ you study harder, youll never pass the final exam.A. If B. Until C. Unless D. Except4Well stay at
10、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 6 I dont know if he _. He will come if it _. Acomes; wont rain Bwill come; doesnt rain Ccomes; doesnt rain Dwill come; wont rain 7Do you know what
11、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 Bthere 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
