第1个回答 2016-09-18
What were you doing when I called you last night？
I was sitting in a cafe when you called.
When you arrived at the party, who was there?
Susie was watching a film when she heard the noise.
Yesterday I went to the library, next I had a swaim, later I met Julie for coffee.
We were playing tennis when John hurt his ankle.
What were they doing at 10 pm last night - it was really noisy.
He was taking a shower when the telephone rang.
He was in the shower when the telephone rang.
When I walked into the room, everyone was working.
区别的方式就是看是当时持续在发生的事情，还是瞬时发生的事情。比如第二题，sitting in a cafe就是持续发生的事，用过去进行时，而you called是瞬间的事情，用一般过去时。
望采纳。
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