当你不知道这个空位有没有人坐时，不要指着椅子、打打眼色就算问过了。学习以下对话，下次面对陌生人就不会不知所措咯。
　　


　　Example 1
　　A: Excuse me. Is this seat taken?
　　B: I don’t think so.
　　A: Can I sit here?
　　B: Sure, no problem./ Of course, go right ahead.
　　Example 2
　　A: Excuse me. Does anyone sit here?
　　B: No, go ahead.
　　Example 3
　　A: Excuse me. Is anyone using this chair?
　　B: Oh, yes. Sorry. My friend will be back in a moment.
　　A: No problem.