there is little i can do to help him.请问to 启一个什么作用,这是什么语法现象,然后这个句子成分

问题描述:

there is little i can do to help him.请问to 启一个什么作用,这是什么语法现象,然后这个句子成分
怎么分析,属于什么句

there is little i can do to help him.
there be句型
little 先行词 后面定语从句
I can do ...(to help him目的状语)