动词不定式的用法The found the lecture hard to understand 为什么用to unde

They found the lecture hard ( ).A.to understand B.to be unde They found the lecture hard to understand.为什么不是“to be unders make the world easier to understand有这种用法吗?为什么make后面是用to unde They found the lecture hard . 　　A. to be understood B. to un they found the lecture hard ____. 动词不定式的用法The best way to raise money is to sell newspapersThe the book is very hard to understand 为什么要用 to? _____is hard to understand the english words. we found the work hard to do . to的动词不定式的用法是什么? i found it hard _____(understand ) him为什么要填to understand I found it hard ___(understand) him. 填什么?为什么?填to understand