it is hard to understand this kind of Books 去掉形式主语后,下列哪一种是对的?改形式主语有什么要求
问题描述：
it is hard to understand this kind of Books 去掉形式主语后,下列哪一种是对的?改形式主语有什么要求
Books of this kind is hard to understand
To understand this kind of Books is hard
答
第二个正确.To understand this kind of books is hard.
原句it is hard,做什么hard?“理解这类书 ”is hard