文档介绍：Unit 3
Grammar Focus
If you need help, what should you say politely?
1. Sweep the floor, Peter!
2. Can you sweep the floor, Peter?
3. Could you please sweep the floor?
Which is the most polite one?
Could I stay out late?
Could I use the car?
Sorry, you can’t. I have to go to a meeting.
Could I get a ride?
No, you have a test tomorrow.
Yes, you can.
Grammar
Could you please clean your room?
Yes, sure.
Could you please do the dishes?
Sorry, I can’t. I have to do my homework.
Could I go to the movies?
Yes, you can.
Could I use the car?
No, you can’t. I have to go out.
could
can 的过去时
礼貌的请求
提出建议
推测
I could run fast when I was a child.
Could you help me?
You could talk to your teacher now.
He couldn’t be at the school then.
Could you please clean your room?
你能打扫一下你的房间吗?
在表示请求帮助或请求允许的疑问句中,我们常用could代替can, 以表示礼貌、委婉或不确定的语气,而can 则不具有这些语气。这样用时,不能把could 看作为can 的过去式。
Could you please …? 请你……好吗?
这里的could 不是表示一般的过去式,而是用来表示委婉地提出请求。
Could you please do sth?
Yes, I can.
All right.
“Yes” Sure.
No problem.
Certainly.
No , I can’t…
I have to ---
“No”
Sorry, I can’t…
I have to ---
1. could表示请求,语气委婉,显得有礼貌
Could you please clean your room?
你可以打扫你的房间吗?
肯定回答:Yes, I can.
是的,我可以。
Yes, sure. / Yes, of course.
否定回答:
Sorry, I can’t. I have to do my homework.
对不起,我不得不做作业。
2. could表示请求许可,希望得到允许。
Could I go to the movies?
我能去看电影吗?
肯定回答:Yes, you can.
Yes, sure.
当然可以。
否定回答:No, you can't.
不,不行。