he must be a doctor
他想当成为一个医生,意思是"一般将来式中的"是"",即成为.
he must be swimming
这是一个现在进行式的句子.由于英语中的两个动词不能并列使用,所以第二个动词变化为现在分词:
一般现在式句形:主语+动词;
现在进行式句形:主语+系动词+动词现在分词(动词+ing),
此句中be为构成现在进行式句子的辅助词语,无实际意义.
he must be a doctor
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