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1、 Unit 3 Could you please clean your room? 语法及写作Grammar Focus语法讲解： 一情态动词could的用法1. 提出礼貌的请求（1）句型“Could you do?/Could you please?” 意为“请你做行吗？”或“麻烦你做好吗？”（2）对这种提出请求的肯定与否定回答的常用语：肯定回答：Certainly./Of course./With pleasure./No problem./Yes, sure.- Could you please make your bed?- Yes, sure.否定回答：No, I cant./Cer
2、tainly not./No, Im afraid I cant.- Could you please clean the living room?- Sorry, I cant. I have to do my homework now.2. 提出请求或征求许可（1）句型：“Could I do?”意为“我可以做吗？”（2）无论是“Could you please?”还是“Could I do?”句型，其答语中一般都避免用could来回答。- Could I go to the movies?- Yes, you can.学以致用(1) - Hi, Jack! Could you come
3、to our English party?- Sorry, I_.I have to look after my little sister at home.A. must B. could C. cant(2) - Jeff, Jack! Could you tell me how to order a taxi through “Didi”?- _A. Youre welcome B. Sure C. Take it easy D. It doesnt matter解析：（1）C. 不能 （2）B. 情景交际，肯定回答用sure二. When/while/as引导的时间状态从句1. whe
4、n可以跟延续性动词，也可以跟短暂性动词连用；while和as只能和延续性动词连用。例：I was out when you arrived. 当你到达的时候我在外面。I came home while he was asleep. 当我回来的时候，他正在睡觉。2. 使用when时，主、从句的谓语动词可以先后或同时发生；while和as主、从句的谓语动作必须同时发生，且while后面一般用进行时态。They had left when I got the airport.当我到达机场之后，他们已经离开了。When(while/as ) we were dancing，a stranger cam
5、e in. 当我们正在跳舞的时候，一个陌生人进来了。3. 将来时从句常用when，并遵循“主将从现”的原则。例：I will tell her when she comes here.4. as常表示“随着”；“一边，一边”，例：The students took notes as they listened . 学以致用(1) -Im going to the post office. -_ you are there, can you buy me some stamps?A. As B. While C. Because D. If(2)Wewereswimminginthelake_s
6、uddenlythestormstarted.A. when B. while C. until D. before(3) _ you meet a word you dont know, consult the dictionary.(4) The students took notes _ they listened. (5) _ the wind rose the noise increased. (6) She called _ I was out. (7) We must strike _ the iron is hot. (8) _you have finished your wo
7、rk, you may have a rest.解析：(1)考察while引导的时间状语从句 （2）when后加短暂性动词 （3）when引导的时间状从 （4）一边一边 （5）随着 （6）当；call短暂性动词 （7）当，when (8)when引导的时间状语从句作文专题：点拨：本单元的写作要求是对50年后学生生活的变化进行描述。需要想好从哪几个方面去写50年后的学生生活，如：上课方式，学习方式，学校的改变等；时态多为一般将来时。建议句子: I think students life in 50 years will be quite different from ours today.They will ., They wont .Since they., they dont have to.范文：
