为什么i judge him to be 40 years old中间要加to be 呀

分析句子结构 I believe him to be honest . 主语是 I， 动词是 believe ， 宾语为~

这句句子结构是主谓宾补结构。分析如下：
主语——I。
动词——believe。
宾语——him（代词宾格）。
宾语补语——to be honest，补充说明宾语him。
这里的动词也叫做不完全及物动词。
不完全及物动词，是需要宾语补语的动词，宾语补语补充说明宾语的状态、性质、身份。如：
They found the stranger a spy.
他们发现那陌生人是一个间谍。
We must always keep the classroom clean.
我们必须使教室保持干净。
All work and no play makes Jack a dull boy.
只工作不玩乐，聪明的孩子也变傻。
I’m going to paint my house white tomorrow.
我明天要把我的房子漆成白色的。

你好。其实，在英语中，并不存在misunderstand sb. to do / be sth 这个结构。你的句子最好改写成：
I mistook him for his brother.

to be 在这里做系动词的不定式.
是谓语judge 宾语补语。
也是him的补语。
这种类型很多， 例如：
He seems to be 40 years old.
It seems him to be 40 years old.

这是judge的用法，judge某人做某事的结构为judge sb. to do sth.

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嬴战茵莲：[答案] 这是不定式作宾补的现象.楼主自己去查资料吧!

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