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to be+形容词的问题

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to be+形容词的问题
经常看见to be adj.这种结构的形式,to be加个形容词在句中,这是什么用法?固定的吗?为什么不直接用那个形容词而要加个to be?
比如 We believe him to be guilty.
The teacher asked the students to be quiet.
The book is believed to be uninteresting.
为什么不直接接形容词
We believe him guilty.
The teacher asked the students quiet.
The book is believed uninteresting.
而非要加那个动词不定式啊?
比如The room was found dirty.就没有说to be dirty.
为什么啊?请高手帮菜鸟解答,不懂的别乱发言,谢谢了`
verb(动词)+to do是一些动词的用法,有一种情况可省略to do(do为be动词时),即当be 后的形容词描述了宾语的目前状况或性质,如The room was found dirty.中dirty是room的性质,类似地,We believe him to be guilty.也可省略to be
而The teacher asked the students to be quiet.中quiet不是student的性质则不可省to be