(1/2)We must ask Tom to clean his room again Tom _ _ _ to cle

问题描述:

(1/2)We must ask Tom to clean his room again Tom _ _ _ to cle

此题答案是Tom must be asked to clean his room again
含有情态动词的被动语态:含有情态动词的主动句变成被动句时,由“情态动词+be+过去分词”构成,原来带to的情态动词变成被动语态后“to”仍要保留。.

must be asked
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Tom (must be asked) to clean his room again.
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