Modal V.+be表示推测，其中
对过去可能性不大的推测
may have done 可能已经
may have been N./ADJ./ADV. 可能已经是
may have been doing 可能在……
对现在可能性不大的推测
may be +n./adj./adv. 可能是
may be doing 可能在
对现在肯定的推测
must be +n./adj./adv. 一定是
musr be doing 一定在
对现在否定的推测
can't be +n./adj,/adv. 不可能是
can't be doing不可能在
对过去肯定的推测
must have been+n./adj./adv. 一定是
must have been diong 过去一定在……
must have done 过去一定干了
对过去否定的推测
can't have been+n./adj./adv.过去不可能是
can't have been doing 过去在
can't have done过去不可能干了
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