过去进行时

Question

We were driving into the city when we had an accident.
When we were driving into the city we had an accident.
那一句是真确的呢？还有when while在什么地方使用呢？

Answer 1

We were driving into the city when we had an accident是正确的。
be doing sth...when...一个动作正在进行被另一个动作打断。“正在做...突然...”
be about to do ...when 一个动作正要进行被另一个动作打断。“正要做...突然..."
如：He was watching TV when someone knocked at the door.
He was about to go out when it rained.
when (1) 当..时候，接延续性动词或非延续性动词
（2）be doing/be about to do...when...此时when 意思是"突然”
（3）= since/now that"既然“
Since we had no money, we'd better not buy this car.
while （1）当...时，只能接延续性动词
（2）而，然而，表示对比
I like music while he likes sports.
(3) 尽管 = though/although
While he worked hard, he didn't succeed.

Answer 2

正确的是： When / While we were driving into the city ，we had an accident.

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Answer 3

什么是过去进行时？

Answer 4

When we were driving into the city，we had an accident.
We were driving into the city when we had an accident.