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1、Unit 4 Why dont you talk to your parents?语法篇一教学目标学生通过本讲学习，能够掌握本单元的重点语法，并在综合能力上有一定的拓展。二知识点梳理1. Why dont you do sth?=why not do sth 为什么不做?2. 在带有till或until引导的时间状语从句的主从复合句里，如果主句用肯定式，其含义是“一直到时”谓语动词只能用延续性动词。如果主句用否定式，其含义是“直到才”, “在以前不”, 谓语动词可用瞬间动词。例如：The young man read till the light went out（熄灭）.Lets wait
2、until the rain stops. We wont start until Bob comes. Dont get off（从下来） until the bus stops.【Till是指直到某一特定事件发生的时候，而在那个时刻之后，该事情或状况仍将持续。 Until是指直到某一特定事件发生的时候，而讲话的人在自己心里认为，在那个时刻之后，该事情或该状况将中止（不怎么可能持续）。固定组合里from morning till night，till/until是不能替换的，】3. so that (1)目的状语从句通常由 so that, in order that（为了，以便）引导。例如
3、：We started early so that we could catch the first train.He studies hard so that he could work better in the future.We used the computer in order that we might save time.(2) so that既可引导目的状语从句，又可引导结果状语从句。区别这两种从句的办法有两个：1)目的状语从句里往往带有情态动词can, could, may, might等。2)从意思上看，目的状语从句往往表示的目的很明确。例如：Speak clearly
4、so that they may understand you. (目的状语从句)Jack is badly ill so that he has to rest. (结果状语从句)4. Although(1)让步状语从句通常由although, though等连词引导。例如：Though he is young, he knows a lot.Although I am tired, I must go on working.(2) although(though)不能用在同一个句子中。例如：我们不能说：Though it was raining hard, but he still wen
5、t out.应该说：Though it was raining hard, he still went out.或It was raining hard, but he still went out.语法规律总结 向他人提建议一、在英语中向别人合理地、有礼貌地提出意见或建议他人做某事，常用一下句型：1. Why dont you do.?/ Why not do.?意为“（你）为什么不做.呢？”。 Why dont you wear a hat?=Why not wear a hat? Why dont you go with us? Could I go to the movies?=Why
6、 not go with us?2. How / What about.?意为“.怎么样？”, about后可接名词、代词或动名词。 How/ What about going out for a walk? Im going to the park. What about you?3. Lets do.意为“让我们做.”。 Lets go to the movies. Lets make it half past nine.4. Youd better (not) do.意为“你最好（不要）做.”。 Youd better go there by yourself. Youd better
7、not smoke here.2、 对他人建议的应答1. 当同意对方的建议时，一般用：Yes, I think so./ Yes, I agree./ Ok. /All right. /Thats a good idea./ Good idea. /Sounds good!/ Yes, please./ Thank you./ Thanks a lot.2. 表示不同意对方的建议或意见时：I dont think so./ Sorry, I cant./ Im afraid./ Id love to. But.即学即练单项选择1. What are you going to do with y
8、our pocket money? give it to the children suffering from AIDS（艾滋病）?A. What about B. What for C. Why dont D. Why not2. What fine weather! Why dont you go out for a walk? ! Lets ask Jim to go with us.A. Sounds good B. No problem C. Thats all right D. Good luck3. How about going camping in the mountain
9、? .A. Me, too B. Good idea C. It doesnt matter D. Help yourself三例题讲解1. I will wait I hear from you. A. untilB. sinceC. whileD. because解析：本题题意是我会一直等到你的来信，主句用肯定式，其含义是“一直到时”，谓语动词是延续性动词。故选A。2. the work is difficult, all the workers are keeping on working. A. ButB. AlthoughC. AndD. So解析：此题题意为尽管工作很难，所有的工人
10、都在继续工作。本题为让步状语从句，故选B。3. We turned on the light we could see what had made a big noise. A. howB. so thatC. in order toD. although解析：此题题意为我们打开灯以至于我们能找出什么制造出这么大的噪音。因为横线后是句子，故选B。4. Would you mind him here? A. sitB. sittingC. to sitD. sits解析：mind doing/ mind +宾格+ doing/mind+形容词性物主代词+doing，故选B。5. Music is
11、nt Sallys main interest, she doesnt want to go to the concert today. A. butB. soC. orD. and解析：音乐不是Sally的主要兴趣，因此她今天不想去这个音乐会，故选B。四课堂训练基础演练一、单项选择1. - This book is a bit difficult. read something easier?- All right. A. Why not toB. Why dontC. Why notD. Why not you2. - Why dont you music club?- Im sorry.
12、 I cant sing or dance. A. to joinB. joinC. joiningD. to join in3. hes tired, he keeps working. A. Although; butB. Although; /C. /; althoughD. But; /4. Mike feels happy every day he is poor. A. ifB. soC. becauseD. although5. Tom didnt have dinner his mother came back from work. A. whileB. unlessC. un
13、tilD. since6. You must work harder and harder you can go to a better college. A. in order toB. so as toC. thatD. so that7. Lily knows some Chinese, she can read the words on the bottle. A. soB. orC. butD. for8. We need one person to take part in the game, you him. A. both; andB. neither; nor C. either; orD. not only; but also9. We didnt know each other at that time, were good friends now. A. becauseB. sinceC. butD. if10. I will stay with you the do
