语法图解
探究发现
①I needed to cool some bottles of white wine quickly, so I put them in the freezer.
②Before he volunteered to direct the traffic, Timoteo had had lots of jobs.
③He had been a miner and a soldier.
④Then one day while he was working as a lorry driver he had a close encounter with death.
⑤He was driving a lorry load of bananas when he came off the road at a bend and fell three hundred metres down the mountain.
⑥This last experience had a profound effect on Timoteo.
[我的发现]
(1)一般过去时表示过去某个时刻发生的动作，或过去经常发生的、习惯性的动作，如例句①⑥。
(2)过去完成时表示在过去某一时间或动作之前已经完成的动作，即过去的过去，如例句②③。
(3)过去进行时表示在过去某一时刻或某一段时间内正在进行或发生的动作，如例句④⑤。
