過去完成時
　　1.概念
　�。�1）表示過去某時之前業(yè)已發(fā)生的動作，發(fā)生在前面的用過去完成時，發(fā)生在后面的用一般過去時。
　�。�2）在過去某時之前，動作已經(jīng)完成或結(jié)束。
　�。�3）造成的是對過去的影響或結(jié)果，與現(xiàn)在沒有關系。
　　（4）過去完成時一般都有過去時相襯托。
　　2.基本結(jié)構(gòu)
　　S+had+動詞的過分（P.P.）
　　When I got to the station the train had left.
　　I had been at the bus stop for over one hour when a bus finally came.
　　I had wanted to attend the meeting, but I fell ill.(未完成)
　　3.難點
　�。�1）當幾個動作用and， then, but等連詞時，因為有動作先后順序，須用一般過去時。
　　He stood up, took his coat and went out.
　　(2)如果有after, before, as soon as等連用，且清楚有動作先后，從句一般用過去時或過去完成時。
　　I told them the news after you (had) left
　　As soon as I (had) put the phone down it rang again.
　　They had already sold it when I asked the price of that car.
　　(3)注意固定搭配來自www.Examw.com
　　hardly...when..., no sooner...than, scarcely...when etc.
　　He had hardly arrived when it began to snow.
　　We’d scarcely arrived when she started crying.
　　(4)用于hope, intend, mean, think等詞的過去完成時，表示未實現(xiàn)的愿望。
　　We had thought to return early but they wouldn’t let us go.
　　(5)用于expect, hope, want, think等詞的過去時，表示“比……”。
　　It was easier than I had thought.
　　We arrived earlier than we had expected.
　　The place wasn’t as clean as we had wanted it to be.