过去进行时是英语语法中的一种时态，用于描述在过去某个时间点正在进行的动作。在句子中，我们常常使用时间状语来说明这个时间点。以下是一些常见的过去进行时中使用的时间状语。
at + 时间点：例如，at 3 o'clock yesterday afternoon，at that moment，at the time of the accident等等。
during + 时间段：例如，during the party，during the summer，during the meeting等等。
while + 动作：例如，while I was cooking，while I was studying，while I was sleeping等等。
as + 动作：例如，as I was walking，as I was talking，as I was driving等等。
when + 动作：例如，when I was working，when I was eating，when I was watching TV等等。
all day/night/week long：例如，I was studying all night long，he was sleeping all day long，they were working all week long等等。
constantly：例如，I was constantly thinking about it，he was constantly checking his phone等等。
以上这些时间状语是过去进行时中使用最频繁的。当我们想要描述过去某个时间点正在进行的动作时，可以根据情境和需要选择合适的时间状语来使用。
