虚拟语气中,什么时候用would have done,would do

题目

虚拟语气中,什么时候用would have done,would do
He was very busy yesterday,otherwise he would come to the party.
He was very busy yesterday,otherwise he would have come to the party.
一道英语题,答案唯一.怎么分析那个正确?
再帮我我举几个例子吧.

答案

would have done是对过去的虚拟,would do是对现在或将来的虚拟第二句正确,“come to the party”是过去发生的事,句子对过去虚拟,所以用would have done顺带说一句,这句句子是混合虚拟语气.如果是正常的虚拟语气句,主...