while和when过去进行时的用法
过去进行时是英语语法中的一种时态，用来描述过去某个时间点正在进行的动作。在过去进行时中，有两个常见的引导词：while和when。本文将详细介绍这两个引导词在过去进行时中的用法。一、while引导的过去进行时
1. while引导的过去进行时表示在过去某个时间点正在进行的动作，同时另外一个动作也在进行。
例如：
- While I was cooking dinner, my husband was setting the table.（当我在做晚饭的时候，我丈夫正在摆餐具。）
- While we were watching TV, the phone rang.（当我们在看电视的时候，电话响了。）
2. while引导的过去进行时还可以表示两个事情同时发生，但并不一定是同时进行的。
例如：
- While I was in college, I studied abroad for a year.（当我还在大学时，我去国外留学了一年。）
- While she was working at the bank, she met her future husband.（当她在银行工作的时候，她遇到了她未来的丈夫。）
二、when引导的过去进行时
1. when引导的过去进行时表示在某个特定的时间点正在进行的动作。
例如：
- When I arrived at the party, everyone was dancing.（当我到达聚会的时候，每个人都在跳舞。）
- When we got to the beach, the sun was setting.（当我们到达海滩的时候，太阳正在落山。）
2. when引导的过去进行时还可以表示一个动作在另一个动作进行的时候发生。
例如：
- When I was studying for my final exam, my roommate was listening to music.（当我在为期末考试学习的时候，我的室友在听音乐。）
- When the teacher was lecturing, some students were taking notes while others were sleeping.（当老师在讲课的时候，有些学生在记笔记，而有些学生在睡觉。）
总之，while和when引导的过去进行时都表示在过去某个时间点正在进行的动作。while还可以表示两个动作同时进行，而when表示一个动作在另一个动作进行的时候发生。在使用时，需要根据具体的语境选择合适的引导词。
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