过去进行时

[玫瑰]过去进行时 when 一般过去式

例如：I was telephoning a friend when Bob came in.

​​[玫瑰]一般过去式 while 过去进行时

例如：She didn’t want to stay in bed while the others were working in the fields.

He broke a chair while he was jumping up and down.

​[玫瑰]while 所在主从句动作持续相等时间时，主从句都用进行时；两个动作一长一短，则短的用一般过去时，长的用过去进行时。

例如：I was cooking the dinner while he was playing the piano.

He called his mother every week even while he was traveling around the world.

过去完成时

​[玫瑰]表示某个动作在“过去的过去”完成。

例如：The bus had already left by the time I got there.

例如：By the end of last week, she had stayed in the west of China for two months helping the homeless children.

​[玫瑰]在含有间接引语的宾语从句中，主句一般过去时，从句过去完成时。

例如：He told me that he had already seen the film.

过去将来时（would do；was/were going to do）

​[玫瑰]come，go，start等动词，其过去进行时表示过去按计划即将发生的动作。

例如：He said he was coming this evening.