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