求he is to leave for...的句子成分分析

问题描述:

求he is to leave for...的句子成分分析
另外这是不是主系表结构?
和 it is adj. to do 表示的意思一样吗?

两个是有区别的he is to leave for 中 is to leave for 是谓语
而 it is adj.to do 是主系表结构 is 是谓语 adj.是表语