Question

what did you do yesterday?

what did you do yesterday?回答时用动词过去时么？
并帮我回答一下What happened？
答得好给财富

Answer 1

比如问你昨天做什么，你肯定回答昨天做了什么了啊，所以用过去式i did nothing yesterday

这个地方的what happened为什么问的是happened，解释一下，问这个问题实际上是事情已经发生过了，所以用what happened 而不用what happen，所以回答也是过去式。nothing happened here

Answer 2

对啊就用过去时因为有yesterday这个时间状语。
回答： I joined in the swimming club。

Answer 3

这个肯定了，昨天的事自然用过去式。至于what happened？意为怎么了，你自己可以看情况回答，比如说 Nothing！

Answer 4

I bought a computer but it did not work.
http://dict.baidu.com/s?wd=what+happened