过往停止时 是过往某个时间点正在发作的动做，常与表达过往时间状语连用。
如今停止时 是如今某个时间点正在发作的动做，常与表达如今的时间状语连用。
例如：I was doing my homework at this time yesterday.
I am doing my homework now.
过往停止时 强调的是过往某个时间点或时间段正在发作的动做。
过往式 强调在过往的时间发作的动做。
例如：He was playing games at 5:30 yesterdsy.
He played games yesterday.
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