本帖最后由 m5970 于 2013-6-19 01:44 PM 编辑
Melvin0607 发表于 2013-6-19 10:22 AM 
what did you said
are=怪
it should be "what did you say."
In this case “did” is an auxiliary verb that used to form a question.
It takes the tense, while the main verb "say” does not take the tense.
So, the main verb will remain in present tense.
因为你要问人家 讲了些什么。
人家已经讲了所以 已经 是past tense 就要 用did.
然后did 是类似助词 已经表达了那个问题是否发生了,所以过后的动词是不需要换去past tense.