翻译四句话 (中翻英) 1.我们正在上课,这个发生了地震.2.我刚坐下来,这时门铃响了.3.我们正要离开,突然天下起雨来.4.我刚一睡着,电话就响了

1An earthquake took place when we were having class.
2The doorbell rang when I had just taken seat.
3It rained when we were just going to leave.
T4he phone called when I had just fallen asleep.