think 的被动语态

Question

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.

Answer 1

前一个问题：语法上没错。可是was thought 应改为is thought， 改为被动不能把时态给改了。 第二个问题：翻译为这些事或行为被认为是，这种用法很常见，需要掌握！还有什么不明白的吗？追问

为什么thought 后面接不定式?
如果把这句变为主动句是怎样的?

追答

第一个问题：mathematics, science, and technical invention 是被认为取决于逻辑和实验（结果）的。是被动。这个是主动改为被动时要加不等式的，是改成被动的方法之一。
第二个问题：
these are often thought to depend only on logic and experiment.
people often think (that) these depend on logic and experiment
people 是人为加上去的。

Answer 2

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”

Answer 3

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.