要看整个句子的意思了
一般句子是：if sb had done sthg,sb could(might)have done sthg.
但是要是用can 和may 的话,语法上是绝对没有错的.而且语气会更加的肯定,不是：要是…………我就………….而是：要是……我肯定…………
can have done 和may have done 也可用在过去时态里面吗?
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