Unit 12（课件PPT）-【学海风暴】九年级下册初三英语(人教版)

Unit 12 Grammar 九年级英语人教版 授课人：*** * What happened to you on a bad morning? on a bad morning And you? First, I had overslept when the clock went off. Then by the time I ate breakfast, I had hurt my hand with a knife. Before I went to school, I had gone to the doctor. I had forgotten to have breakfast before I went to the office this morning. I had forgotten to have breakfast before I went to the office this morning.今天早晨去办公室之前，我忘记吃早饭了。 【分析】 “去办公室”是发生在过去的事情，而“忘记吃早饭”发生在“去办公室”之前，所以是“过去的过去”，要用过去完成时。 1. 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”。 2. 表示发生在过去的动作对过去的某一时间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。 【定义】 Fill in the blanks. 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 根据汉语提示完成句子。 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，我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。 【观察】 【结论】 I was about to go up to my office when I decided to get a coffee first. As I was waiting in line with the other office