when和while的时态用法区别
whenwhile都是英语中常用的连词，它们的用法有一些区别。
1.when通常用来表示一个瞬间或短暂的时间点，表示某个动作或事件发生的时间。when后面的从句通常使用一般过去时，表示过去某个时间点发生的动作或事件。例如：
When I arrived at the station, the train had already left.（当我到达车站时，火车已经离开了。）
When I was a child, I used to play with my friends every day.（当我还是个孩子的时候，我每天都和朋友们玩。）
2.while则通常用来表示一个持续的时间段，表示某个动作或事件在这个时间段内发生。while后面的从句通常使用进行时态，表示正在进行的动作或事件。例如：
I watched TV while my mother was cooking dinner.（我在我妈妈做晚饭的时候看电视。）
While I was studying, my roommate was listening to music.（当我在学习的时候，我的室友在听音乐。）
需要注意的是，while也可以表示“虽然”的意思，这时后面的从句通常使用一般过去时。例如：While I didn't like the movie, my friends thought it was great.（虽然我不喜欢这部电影，但我的朋友们觉得它很棒。）
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