what should I have told him的have起什么作用？
请问what should I have told him的have起什么作用...
这里的"have"是基本助动词（be, have, do）。根据你的提问，看来你要回到很初级的英语了。了解基本助动词和情态助动词之后，你还要学虚拟语气...
...I have told him的have起什么作用?
原句是现在完成时，去掉语气和语义都发生不同。
英语的We have told him为什么变为过去式的词是tell而...
这是现在完成时，基于现在，所以动词have是现在时，如果是过去完成时则变为had told，不管如何told是不变的。
...ought to have told him about 这难道不是一个句子...
She ought to have told him about it 当然是一个完整的句子,而且毫无语病.简单句有主谓(do)宾,主系(be)表两种,你应该明白这点吧!ought to是情态动词,不能单独使用,...
you should have told him 对还是 you should told him...
should 后要接动词原形 加油！不明白再问！如果帮到你，请及时采纳，谢谢！
9. I would have told him the answer had it been possi...
这对他后来的成功起了很大作用。therefore所以的意思，用在这里不合适，句子无法脸上。一个句子，打了逗号就不会用that了，so that 的意思也不符合。
I would have told him the answer had it been...
答案:A翻译:如果可能的话,我本来早就告诉他答案了,但是我当时那么忙.1.从句意来看,逗号前的句子是对过去发生的动作进行的虚拟,即:I would have told him the answer ...
the villagers have told him
前面是 现在 完成时 have told 那后面的从句为了保持时态一致,就不能用would所代表的 过去时 咯 所以用will
would you have told him
C 考查时态.句意:如果可能的话,你会告诉他这个答案吗?——我会的，但是我那时正在忙。可知谓语动词表示的是过去的某种状态，故用am的过去时态was，选C。
i would have told him more but much to my surprise he...
虚拟语气 前半句是虚拟 后半句是真实语气 我本来想要多跟他说点话 可是令我惊讶的事 他亲了我