过去某时间正在进行的动作

What were you doing at eight o'clock last night?

昨晚八点的时候你在做什么？

I was talking with my mother on the phone.

我正在跟我妈妈打电话。

What was Robert doing at ten this morning?

今天早上十点的时候Robert在做什么？

He was playing tennis with Jack. 他正在跟Jack打网球。

I saw Lisa in the park this morning. 今天早上我在公园看到Lisa。

She was sitting on the grass and reading. 她坐在草地上看书。

I was traveling in Europe (at) this time last year.

去年的这个时候我正在欧洲旅游。