must be . must have been.may be .may have been.如果他们后面加动词，必需是

must be . must have been.may be .may have been.如果他们后面加动词，必需是动词ing的形式吗？？？

婉玉 1年前已收到1个回答举报

13019207836 幼苗

共回答了21个问题采纳率：81% 举报

必须是，因为英语里一句话有且只有一个动词，而这几个短语都含有动词。（be,have,be,have)

1年前

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