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 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 the 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 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 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 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, 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 have 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. hell, 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 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. 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 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 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