1，表示過去某段時間正在進行的動作。 When he arrived at 9:30 am, two people were waiting outside the office.

當他早上9:30到辦公室時，有兩個人在外面等著他。

It was a dark night. The wind was blowing hard and the rain was falling heavily.

那是一個漆黑的夜晚。狂風怒號，暴雨如注。

2，過去一個動作發生時，另一個動作正在進行中.While we were having maths the head master broke into the classroom.

我們在上數學課時，校長闖了進來。

Mary was making a dress when she cut her finger. 瑪麗割破手指時正在做衣服。

3，過去時間里兩件事同時發生. While Mr. Atkins was reading the newspaper, his wife Mrs. Atkins was preparing the dinner.

阿特金斯先生在看報紙的時候，他的妻子阿特金斯太太正在準備晚餐

兩件事同時發生，一般用while表示“當…時候”(不要用when)

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