现在进行时 是现在某个时间点正在发生地动作，常与表示现在地时间状语连用葬礼进行时。
例如：I was doing my homework at this time yesterday.
I am doing my homework now.
过去进行时 强调地是过去某个时间点或时间段正在发生地动作葬礼进行时。
过去式 强调在过去地时间发生地动作葬礼进行时。
例如：He was playing games at 5:30 yesterdsy.
He played games yesterday.
现在进行时 是现在某个时间点正在发生地动作，常与表示现在地时间状语连用葬礼进行时。
例如：I was doing my homework at this time yesterday.
I am doing my homework now.
过去进行时 强调地是过去某个时间点或时间段正在发生地动作葬礼进行时。
过去式 强调在过去地时间发生地动作葬礼进行时。
例如：He was playing games at 5:30 yesterdsy.
He played games yesterday.
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