were you doing是什么时态

例句：

were watching TV from seven to nine last night. 昨天晚上七点到九点的时候我们在看电视。

was he researching all day last Sunday? 上周日他一整天都在研究什么？

brother fell while he was riding his bicycle and hurt himself. 我哥哥骑自行车的'时候从车上摔下来，受伤了。

was raining when they left the station. 他们离开车站的时候天正在下雨。

I got to the top of the mountain, the sun was shining. 当我到达山顶的时候，阳光灿烂。