He must try to help his sister with her math?为什么try不加s

问题描述:

He must try to help his sister with her math?为什么try不加s

must是情态动词,后面只能接动词原形

must情态动词,后跟动词原形

既然大家都说了 我就不回答了 嘿嘿

must 后 加 动词原形

must是情态动词 后面加动词原形 所以不加s