What did you do yesterday?

那你昨天做什么?。

What did you do yesterday morning?

你昨天早上做什么了？

What did you do yesterday afternoon?

你昨天下午做什么了？

Hi, Susie. What did you do yesterday?

嗨，苏希，妳昨天做了什么？

What did you do yesterday, Ben? I planted trees yesterday.

本，你昨天干什么了？我昨天植树了。

What did you do yesterday besides reading some books?

你昨天除了读书还做了什么？

Eg: What was I asking about ? Ay, yes, I was asking what did you do yesterday.

刚才我问什么？哦，有了，（想起来了）我是问你昨天做了些什么。