九年级英语Unit12grammar 课件.ppt

1. By nine o’clock last night, we had got 200 pictures from the spaceship. 2. I had been at the bus stop for 20 minutes when a bus finally came. 3. He said he had worked in that factory since 1949. 4. Mr. Smith died yesterday. He had been a good friend of mine. Read and translate the sentences. 表示过去某一时间或动作以前已经发生或完成了的动作。它表示动作发生的时间是“过去的过去”。 表示发生在过去的动作对过去的某一点造成的某种影响或结果，用来指定在另一个过去行动之前就已经完成了的一个事件。 Finish the task 1. 过去完成时的构成：_____+___________ 2. 过去完成时表示： __________________________________ __________________________________ 3. 过去完成时常与______________________等引导的时间状语连用。 had 过去分词 when, before, by the time 过去某一时刻或动作之前已经发生或完成的动作。 1)当我到达学校的时候，我才意识到我把书包忘在家里了。 _______ I got to school, I realized that I ______ ______ my backpack at home. 2)到我返回学校的时候，铃声已经响过了。 _____ _____ _____ I got back to school, the bell ______ _______. When had left By the time had rung 3)我到达公共汽车站之前， 汽车已经离开了。 Before I _____ _____ the bus stop, the bus ______ _______ _______. 4)我决定先买一杯咖啡，然后再去办公室。 I ______ ______ ______ go up to my office when I decided to get a coffee first. got to had already left was about to 5)就在我和别的工作人员一起排队等候的时候，听到了一个巨大的声响。 As I ______ _______ ______ ______ with the other office workers, I ______ _____ _____ ______. was waiting in line heard a loud sound ◆ When I got to school, I realized that I had left my backpack at home. ◆ By the time I got back to school, the bell had rung. ◆ Before I got to the bus stop, the bus had already left. 由when, by the time, before等引导时间状语从句时，若描述发生在过去的事，主句常用过去完成时(had + 过去分词)表示动作发生在过去的过去。 ◆ I was about to go up to my office when I decided to get a coffee first. ◆ I was reading a book carefully when the doorbell rang. be about to do sth when…正要做某事就在这时突然就… be doing sth when…正在做某事就在这时突然就… 4a Make sentences using by the time or before. 1. Tim went into the bathroom. Mary got up. By the time Mary got up, Tim had already gone into the bathroom