prove不是及物动词吗,为什么句子 although the first part of the book is ea

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prove不是及物动词吗,为什么句子 although the first part of the book is easy,the rest has proved difficult是正确的?不用被动语态吗

prove可以做既无动词,后面接宾语
He has proved his courage in the battle.他已在作战中证明了他的勇气.
但是,prove作"证明是;结果是;事实说明"解时,用作连系动词,无被动语态,这个时候一般后面接形容词或名词做表语或宾语补足语,如
The handbook proved most useful.这本手册证明很有用
She proved a very strict teacher.结果证明她是一位非常严格的老师.
主要区别在于：prove当及物动词的时候,后面的宾语就是它要“证明”的对象,而做系动词时,后面接形容词或名词做表语或宾语补足语,这个时候没有被动语态
你问的句子里difficult是形容词,做prove的表语,所以不用被动（可以大致认为,prove后面接的是形容词的话就没有被动语态,接名词时要看情况）

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