4.一般过去时

　　表在过去某个特定时间发生且完成的动作，或过去习惯性动作，不强调对现在的影响，只说明过去。常与明确的过去时间状语连用，如：yesterday,
　　last week, in 1945, at that time, once, during the war, before, a few days ago, when。

　　考点一：used to + do 表示过去经常但现在已不再维持的习惯动作。to为不定式符号，后接动词原形。

　　比较：be / become / get used to + doing 表示习惯于
　　He used to smoke a lot. He has got used to getting up early.

　　考点二：在时间和条件状语从句中，代替过去将来时。

　　He promised to buy me a computer if he got a raise.

　　5. 过去进行时

　　表示过去某个时间点或某段时间内正在发生的动作。

　　The boy was doing his homework when his father came back from work.
　　He was taking a walk leisurely by the lake when he heard someone shouted for help.
　　What were you doing at nine last night?
　　The radio was being repaired when you called me.

　　6. 过去完成时

　　表示过去某个时间之前已经完成的动作，即过去完成时的动作发生在“过去的过去”，句中有明显的参照动作或时间状语，这种时态从来不孤立使用。

　　There had been 25 parks in our city up till 2009.
　　By the end of last term we had finished the book.
　　They finished earlier than we had expected.

　　考点一：用于hardly/scarcely...when; no sooner ...than句型中，主句用过去完成时，从句用一般过去时。

　　I had hardly finished my work when he came to see me.
　　I had no sooner got into the room than it began to snow.
　　No sooner had I arrived home than the telephone rang. (注意倒装)

　　考点二：表示“第几次做某事”，主句用过去时，从句用过去完成时。

　　That was the second time that she had seen her grandfather.

　　考点三：动词hope, expect, think, intend, mean, want, suppose, plan 用过去完成时，表示未实现的愿望、打算和意图。

　　I had hoped that I could do the job. I had intended to see you but I was too busy.