这是一个主语从句,前面的it是形式主语,真正的主语是to do it,for him是定语,is difficult是系表结构.
It is diffcult for him to do it it是不是形式主语 is diffcult是不是谓语 f
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To do it for him is diffcult对还是 To do it is diffcult for him
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It is +adj+ to do sth中It是形式主语吗?真正的主语是动词不定式to do st