摘要：1．表示对过去事实有把握的推测.具有较大的可能性.只用于肯定句中.否定句和疑问句用cancould have done. His watch must have stopped. 他的表肯定停了. --- I rang your flat yesterday. A man answered but I didn't recognize the voice. 昨天我给你家打电话.一位男士接了电话.但我没听出来是谁的声音. --- Oh, it must have been my brother Peter. 哦.那一定是我哥哥彼得.

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