may have V-ed
结构︰主词+may/might have+过去分词
说明︰此句型意为很可能曾经。表示对过去之事做不太肯定的推测。而may/might+原形动词是对现在或未来事物做推测。might have 所表示的可能性要比 may have 低一些。
He may have overslept this morning. 今天早上他或许睡过头了。
The tea is hot; he may have been here before. 茶还热着,不久前他很可能在这里。
He may have known the truth; otherwise he wouldnt be so angry now.
他当时很可能知道事情的真相,否则他不会这么生气。
The boy might have known the truth, but I am not quite sure.
这男孩当时也许知道真相,但我不很确定。
cannot have V-ed
结构︰主词+cannot have+过去分词
说明︰此句型意为不可能曾经。是对过去之事做否定的推论,此时一定要用 cannot have 或 cannot,不能使用 must not have 或 must not.而cannot+原形动词是对目前或将来之事做否定的推论。
She cannot have written the letter herself. 这封信不可能是她自己写的。
He is honest, so he cannot have stolen my money.他是个老实人,所以他不可能偷了我的钱。
He cannot have caught a cold, because I saw him dancing with Mary the same day.
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