定义

一般过去时常与过去时间yesterday, this morning, just now, a moment ago, in May, last night / year / week, once upon a time, the other day, before …, when – clause, in the past连用。

如：What did you do yesterday? 昨天你干了什么?

I met Lin Tao this morning. 今天上午我会到了林涛。

I was there a moment ago. 刚才我在那儿