过去完成时标志词 五个
1.before I thought I had sent the letter a week before. 2.by By nine o’clock last night, we had got 200 pictures from the spaceship. 3.过去完成时常常用在told,said,knew,heard,thought等动词后的宾语从句（或间接引语）中，这时从句中的动作发生在主句表示的过去的动作之前。 4.since He said he had worked in that factory since 1949. 5.过去完成时还可用在hardly…when…, no sooner…than…, It was the first (second, etc) time (that)…等固定句型中。
标签：五个,标志,完成
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