A 用于推测过去的行动:
He may/might have gone.相当于:
It is possible that he went/has gone./Perhaps he went/has gone.
当时他可能去了。
如果主句的动词是过去时,就必须用might:
He said/thought that she might have missed the plane.
他说/想她可能已经误了那班飞机。
如不确定性已然消失,必须用 might而不用 may:
He came home alone.You shouldnt have let him do that;he might have got lost.
他独自回家了。你本不应当让他那么做的,他可能会迷路的。(但他并未迷路。)
在下一句中也是这样:
You shouldnt have drunk the wine;it may/might have been drugged.
你本不应喝那酒的,里边可能放了药。
it may have been drugged通常表示还不能确定酒里是否放了迷药。
it might have been drugged也可具有与上述相同的含义,但也可能意指现在知道酒里没有迷药。
在叙述最终并未得到检验的事情时用 might而不用 may:
Perhaps we should have taken the other road.It might have been quick- er.
也许我们本应当走另一条路。那样可能更快些。
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