Most single parents find it very difficult to take care of a family alone .分析一下句子结构

题目

Most single parents find it very difficult to take care of a family alone .分析一下句子结构
常看到加形式主语it加形容词,加不定式的这种表达,这句话中it 怎么后不用呢?如果这句话换成most single parents find it is very difficult to take care of a family alone.对吗,
那Most single parents find it very difficult to take care of a family alone .
most single parents find it is very difficult to take care of a family alone有什么差别吗?
什么情况下,都可把两种方式换吗

答案

可以,但是两种用法,在语法上是不同的. 1.Most single parents （主语）find 谓语 it （形式宾语 代to take care of a family alone） very difficult（宾补） to take care of a family alone（动词不定式做实际宾语...