Don’t worry.I will do as much as I can （）（help）you 动词填空.

Don’t worry.I will do as much as I can （）（help）you 动词填空.

to help不定式做目的状语

to help

help

to help ,as much as I can 是插入部分，这个句子中有谓语动词do,所以用to help 动词不定式作状语。