should /could/would 也是情态动词么?shoud/ would 在 过去将来时,和虚拟语气里面是做助动词,那在下面的例句中..shoud +动词原形 是不是 当情态动词用了?如:1.He should stop smoking 2.You should correct mastakes 3

should i would i could should i would i could i could/might/may/would/must/should have+过去分词 Could have done would have done should have done can和could,should,would等词语的用法区别? Will would; shall should ;can could区别和用法 虚拟语气中（should would could）应该怎么选择? 是不是WOULD,SHOULD,COULD后面必须跟动词原形 would should migt could have done有什么不同 could be /must be/ should be/would be的区别 should can may would could 有什么区别 should can may would could 有什么区别 If there___no sunlight in the world,we___in darknessA should be;would have livedB could be;would liveC could be;would have livedD should be;would live would,could, 虚拟语气中would,should,might,could有什么区别书上说，表将来用would/should/might/could+动词原形表将来，没说区别 区别could,might,would,should have done作为虚拟语气could have done,might have done,would have done,should have done怎么区别 虚拟语气中的could/should/might/would的用法我刚学了虚拟语气,但我不知道should/would/could/might的用法. 虚拟语气would should could might四个词用法讲解我的意思是什么时候用would或should或could或might