That is a question to be worked out. 句中的不定式用被动式对不对?因为 work out question没有主语?
动词不定式用主动或被动都可以,但意思稍有区别。
①This is a question to work out.(强调需要人去解决,在不定式前,可以理解为省略逻辑了主语for sb.)
②This is a question to be worked out.(强调了客观存在,在不定式前不能加上逻辑主语for sb.,此句相当于The question remains to be worked out.)
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