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nEED not hAvE DonE

must have done的否定形式是can't have done. 用must来表示肯定、猜测;用can't 来表示动作不可能发生,如: - that must be wrong. - No, it can't be wrong. 过去式举例:He walked past me without speaking. He can't have seen me. couldn'...

情态动词所表达的可能性程度:must/can't  should/shouldn't  might/may (not) 另外两个"类情态词的形式:"need/needn't; have ...

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