比如“我发现读这本书很难”:
I find it hard to read this book.
这句话可以变成 I find that it is hard to read this book. 吗?
谢谢!
I find it hard to read this book. ( it 是形式宾语)
I find( that) it is hard to read this book. ( it是形式主语)
两句都正确,但是前一句更简洁,更常用。