摘要： 请求允许和应答 A: Could I smoke here? / I wonder if I could smoke here. B: Yes . / Yes, do please. / Of course you may. / That's OK . / I'm sorry, but it is not allowed / You'd better not. A: Do you mind if I open the window? B: Not at all./ Of course not./ Certainly not./ I’m sorry, but you’d better not.

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