What were you doing at eight o'clock last night?
I was talking with my mother on the phone.
What was Robert doing at ten this morning?
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.