The book is difficult for you to understand.
这里的不定式可以用被动式吗?
很明显,to understand 之前有了逻辑主语for you,自然不能用被动了:for you to be understood(误)。
如果去掉for you,并且difficult 有程度状语too 修饰时,则可以用被动语态。例如:
The book is too difficult to be understood.
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=To understand the book is difficult for you.
=It is difficult for you to understand the book.
解答如下
这里的不定式是不可以使用被动语态的,因为不定式逻辑主语就是for sb。为不定式动作执行者。