what did you say 和 what did you said 的区别

问题描述:

what did you say 和 what did you said 的区别
不是过去是吗?为什么大家用what did you say而不用what did you said

因为did是表示过去式的,助动词用了过去式,动词就得用原形
在疑问句和强调句中才会有助动词提前的情况,其他时候都是直接用动词过去式的
比如:He visited his uncle yesterday. (普通过去式)
He did visit his uncle yesterday. (强调)
Did he visit his uncle yesterday? (疑问)