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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 …?
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(requests)，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(permission)，希望得到允许。
Could I go to the movies?
我能去看电影吗？