【优选整合】人教版八年级下册英语 unit3 第3课时 课件1 (共25张PPT).ppt

根据所学内容，写出下列短语。 叠衣服 做菜 用某人的电脑 扔垃圾 铺床 扫地 熬夜 生某人的气 带……出去散步 fold one’s clothes do the dishes use one’s computer take out the rubbish make the bed sweep the floor stay out late be angry with sb. take sb. for a walk 打扫客厅 在……上工作 过来 做家务 搭车 clean the living room work on… come over do the housework get a ride Could I go out for dinner with my friends? Sure, that should be OK. Could we get something to drink after the movie? No, you can’t. You have a basketball game tomorrow. Could you please take the dog for a walk? OK, but I want to watch one show first. Could you please take out the rubbish? Yes, sure. 阅读下列句子，观察问句的用法及回答。 Key sentence structures Could you（please）+ V-原形？ 表示委婉地提出请求 1. Could you please clean your room? Yes, sure./ Of course./ Certainly./All right. 2. Could you please do the dishes? Sorry, I can’t. I have to do my homework. —Peter, could you please take out the trash? —Sure, Mom.  —Could you please do the dishes? —Sorry, I can’t. I have to do my homework. 表示请求帮助或请求允许的疑问句中，常用could代替can，表示礼貌，委婉或不确定，而can则不具备这些语气。这时不能把could看作can的过去式。以上两句中用could是为了表示礼貌的请求。表示请求帮助或请求允许时，除了can, could之外，还可以用may，句子的表达方式也有不同，可以用不同的方式来表示同一个概念。例如： ① Could/Can/May I use your car for a day? ② I wonder if I could use your car for a day? 同意可说Yes或Sure或Certainly，还可说Yes, (do) please. 或Of course. (you may/can). 或Go ahead, please. 或That’s OK/all right; 不同意，可以说I’m sorry you can’t. 或I’m really sorry, but I have to use it today. 要避免说No, you can’t. 这样不礼貌。否定回答通常用委婉语气。 ③ Do you mind if I use your car for a day? 作回答可以说Never mind. /Not at all. 表“不介意”。不能用Yes. /Sure. /Of course. /Certainly.等。无论肯定还是否定应答中，要避免使用could，要用can或may。因为应答须用确定的语气。而could在表请求的问句中是为了表示礼貌或委婉语气，用在应答中则成了不确定语气，与情理不符。所以应答中不说Yes, you could. 或No, you couldn’t. 而要说Yes, you can. 或Sorry. /No, you can’t. —Could I please use your computer? —Sorry, I’m going to work on it now. —Well, could I watch TV? —Yes, you can. Could I/you please …？表示一种有礼貌的请求或提议，其后连接原形动词，比Can you /I…？