My father stayed there for two months.for two months划线提问答案是How long did your father stay?为什么不是 how long did your father stayed
问题描述：
My father stayed there for two months.for two months划线提问答案是How long did your father stay?
为什么不是 how long did your father stayed
答
助动词did后面用动词原形
答
did助动词提前，谓语动词要变成原形啦。。
所以是How long did your father stay?
答
前面已经有了助动词did,说明了过去式,后面的动词必须用原形.
很高兴为你解答!
多谢你的问题!
答
前面已经用了助动词did,所以后面动词用原形