think 的被动语态

以下句子的改法对吗?
I think that he is a thief. 变被动That he is a thief was thought by me.
还有一个长句中的被动语态thought的后面为什么接不定式?
One can draw examples from genius in any field, from religion, philosophy,and literature to art and music,even in mathematics, science, and technical invention, although these are often thought to depend only on logic and experiment.

有些以that从句作宾语的主动句可以转换成两种形式的被动句。如：

People say that he has splendid professional skills.
1. It is said that he has splendid professional skills.

2. He is said to have splendid professional skills.

重点句型：Sb is said to do sth. It’s said that-cl.
常用于上述被动句型的动词有believe, consider, expect, find, know, report, say, think等。

所以 I think that he is a thief可以改为
1. It is thought that he is a thief.
2. He is thought to be a thief.

be thought 句子里做谓语，后面接了不定式to be.....做宾语，不加to就会有两个动词 thought 和紧跟的be，这不符合语法，而to后面必须接动词原型，故后面就是to be。你可以从某些句子理解这个句子，如：he is thought to be the best teacher of my school.他被认为是我们学校最好的老师。 is thought 是谓语，被认为的意思，被认为的内容是to be the best teacher ....，be的意思相当于“是”

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