虚拟语气中had done与would have done,did与would do 的用法有何区别

虚拟语气中had done与would have done,did与would do 的用法有何区别 虚拟语气中的would/conld/should do/have done 与 did/had done有何区别 虚拟语气中would could should might have done与had done都是表示过去,在用法上有 虚拟语气would have done 的用法 英语虚拟语气中sb should /would do(have done) 与主语人称的搭配有什么讲究吗 虚拟语气中的would have done 与could have done结构 有什么 区别?什么时候用would什么 虚拟语气中,什么时候用would have done,would do should have done 与would have done有区别吗?有would/should had done 情态动词中 should might could would + have done 与 它们在if 虚拟语气中用法 有 would rather did 与 would rather have done 的区别? would have done 和would had done 分别用在什么句子中?请举例句说明（虚拟语气的用法） 求虚拟语气的讲解 had sb done sth,sb would have not done