you would have stayed with her .和 you could have stayed with her .
---- I stayed at a hotel while in New York.
---- Oh,did you You _______ with Barbara.
A.could have stayed
B.could stay C.would stay D.must have stayed
请问,这里用would have stayed是否可以.
could have stayed 和 would have stayed
此句是虚拟语气用法，表示推断某人在某时做过某事。他会说：“You can stay with her.”不是说：“you will stay with her”。因为是过去发生的，用了过去式：have stayed.can 使用了虚拟语气could.而情态动词不接过去式，表过去只能接现在完成时或者过去完成时。所以，只能接:You could have stayed with her.表推断。
但是，为什么不接:You could had stayed with her.表示实际上对话人并没有在过去访问New York的时候和Barbara在一起呢？
实际上，主人公在访问New York的时候是否和Barbara在一起？而提问的人是否知道他们在一起呢？提问者不知道主人公去过New York，不知道他们是否在一起。所以，只能推断、假设他们可以(can)在一起的。