yesterday evening是什么时态的标志词

　　例句：

　　He was reading a storybook yesterday evening.

　　昨天晚上他正在看故事书。

　　Did your father watch a film yesterday evening?

　　你爸爸昨天晚上看了电影了吗？

　　Did you watch the 7 o'clock program on Channel 2 yesterday evening?

　　你昨天晚上看了第二频道7点钟的节目了吗？

　　The police then found out that the keys belonged to Mr. Paul White, who visited Mr. Johnson at his home yesterday evening.

　　然后警察发现钥匙是保罗·怀特先生的，他昨天晚上到约翰逊先生家里去了。