A、  B、  C、  AMay I…?(……可以吗?)→允许的肯定回答

Wasn’ t the side table more useful in that corner?
(A) No, it’ s on the sofa.
(B) Yes, let’ s move it back.
(C) Turn right at the corner.

Excuse me, may I ask you something?
(A)  Sure, how can I help you?
(B)  No, go ahead.
(C)  I’m sorry I was late today.