would 将should 应该might 也许could 可能have done 已经做了have done 可以加在前面四个单词后面,表示过去将来时I would have done my homework if you didn't call me.如果你没给我打电话,我已经做完作业了.You sh...
would should migt could have done有什么不同
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should have done;must have done;need have done;could have do
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would have done和should have done的意思