语法问题！

Question

Family environment is widely believed to be the most important inflence on children's development.

这里不定式TO BE是用的被动语态吗？？形式不是应该是 to be done 吗？？为什么to be 后面直接是 the most important ..

Answer 1

解析：

(Family environment) (is (widely) believed) (to be) (the most important inflence on children's development).

(Family environment) 是主语

(is (widely) believed) 是谓语，believe的被动式，中间又夹个了adv

(to be) 前面已经有了个谓语，所以这个他用了动词不定式 (to do, to be 形式(属于非谓语动词的一种))

(the most important inflence on children's development) 是宾语

目测结果：

这是一个是主谓宾结构的，用了被动语态以及动词不定式的说。。。

Answer 2

这里不定式短语TO BE。。。是 主语补足语 (即原来的宾补)与主语是主动关系 不是被动关系

另外be动词 也没有被动语态
原句主动语态是people widely believe family environment to be the most important inflence on children's development.
=people widely believe that family environment is the most important inflence on children's development.
=it is widely believed that family environment is the most important inflence on children's development.追问

谢谢！！~

追答

很负责地告诉你
你的句子是被动语态根本就没有宾语 。原来的宾语变成了主语 原来的宾补变成了主补
主动语态的句型是belive sb/sth to do sth