must have been may have been

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?

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第1个回答 2019-10-21

must be + doing/done
must have been +done
may be +doing/done
may have been+ done

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must be . must have been.may be .may have been.如果答：must be + doing/done must have been +done may be +doing/done may have been+ done

must have been may have been答：must be + doing/done must have been +done may be +doing/done may have been+ done

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...been\must be\must have been\can't be \may have been\may be...答：may be must be can‘t be can’t have be may be may be 望采纳

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should have been may have been have和have been can’t have been musthavebeen must been done have been gone must have done否定 would have been