动词过去式后的动词怎么弄？如：I helped him clean the room,为什么clean不用变？求速度！

Question

如题所述

Answer 1

这是help 的固定用法，help sb do sth或help sb to do sth.
在宾语从句中才要变。e.g.:He said that he cleaned the room.

Answer 2

help sb do sth 帮某人做某事，固定搭配，所以不用变。