what did you do at lunch time yesterday?What were you doing at lunch time yesterday?有什么区别?

问题描述:

what did you do at lunch time yesterday?What were you doing at lunch time yesterday?有什么区别?

What did you do at lunch time yesterday?昨天午饭时间你做了什么?(一般过去时)
What were you doing at lunch time yesterday ?昨天午饭时间你正在做什么?(过去进行时)

did you do是问做了什么 were you doing是问正在做什么

一个一般过去式,表示对过去事实的陈述.换句话说,就是说 你在那个【时间段】干过了什么;
一个过去进行时,则表示在某个时刻正在干某事.强调该【时刻】的某个具体动作.