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 understandTo understand this kind of Books is hard
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
To understand this kind of books is hard.
原句it is hard, 做什么hard？“理解这类书 ”is hard
答
第二个正确，it是形式主语，真正的主语是后面的不定时
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
答
第二个To understand this kind of Books is hard