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通常情况下当句子的主语是不定式的逻辑宾语的时候,不定式用被动式 The fridge needs to be repaired. 关于 want , require ,need 这个三个词 特殊用法,当需要讲解时候,有下面几种表达 (1)主语+wants + doing sth = Sth wants to be done The room wants cleaning = The room wants to be cleaned (2)主语+requires doing sth =sth requires to be done Your hair requires cutting = Your hair requires to be cut (3)主语+ needs doing sth = sth needs to be done This computer needs repairing = This computer needs to be repaired 通常情况下当句子的主语是不定式的逻辑宾语的时候,不定式用被动式 是需要一个条件的 条件就是,动词不定式是做谓语动词的宾语,放可以用被动语态,如果是做状语,或者定语不可以这样被动语态的, 例如 He asked to be operated on immediately (非谓语动词,动词不定式作谓语动词宾语,可以用被动) The boy wanted to be invited to go there (非谓语动词,动词不定式作谓语动词宾语,可以用被动) The man hoped to be given an opportunity to try it again (非谓语动词,动词不定式作谓语动词宾语;可以用被动) He has a lot of work to do (非谓语动词,动词不定式作定语, 不能用被动) The girl is hard to please (非谓语动词,动词不定式作状语, 不能用被动) 请切记将以上区别搞清楚,什么时候可以用被动,什么时候不可以用被动 满意,请立即采纳,谢谢!