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课件网) Unit 12 Life is full of the unexpected. Section A GF-4C 1. To learn to understand the use of Past perfect tense 2. To be able to write sentences using by the time or before 3.To understand the differences between the Present and Past perfect tense Learning Objectives lead in Let’s learn more about Past Perfect Tense Grammar Focus 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. 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 workers, I heard a loud sound. Read the sentences and find out the Past perfect tense 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 Grammar Focus 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 _____ _____ _____. got to had already left 过去完成时由“助动词had (用于各种人称和数) + 过去分词”构成，表示某动作或状态在过去某一时间或动作之前已经发生或完成，它表示动作发生的时间是“过去的过去”。 过去的过去 过去某时 现在 将来 过去完成时 从过去之前的某个时间点到过去的某个时间点为止 （先发生） （后发生） Concept and forms 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. 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 workers, I heard a loud sound. 2.主句为过去完成时，从句是一般过去时，主句动作发生在从句之前。 1.两个动作同时进行，主从句都是一般过去时或过去进行时。 Concept and forms (1) 肯定句：主语 + had + 过去分词 + 其他. (2) 否定句：主语 + hadn’t + 过去分词 + 其他. (3) 一般疑问句：Had+ 主语 + 过去分词 + 其他 肯定回答：Yes, 主语 + had. 否定回答：No, 主语 + hadn’t. (4)特殊疑问句：疑问词＋had ＋主语＋过去分词＋…？ Structure of setence 1.由时间状语来判定 ① by+过去的时间点 She had finished reading the book by 9 o’clock yesterday. ② by the end of+过去的时间点 We had completed all the work by the end of last month. ③ before + 过去的时间点。 The movie had started before I arrived at the cinema. 一般过去，后发生 过去的过去，先发生 Judgement method had done ④when + 过去的时间点。 When I got to school, I realized I had left my at home. 2.由“过去的过去”来判定 ①含有宾语从句的复合句中：当主句为一般过 去时，且从句的动作先于主句的动作发生时， 从句要用过去完成时。如在told，said， knew，heard，thought等动词后的宾语从句中。 She said that she had seen the film before. 看电影是在她说之前做的。 Judgement method had done 2.由“过去的过去”来判定 ②含有状语从句的复合句中，主、从句的动作发生有先后关系，动作在前的要用过去完成时，动作在后的 ... ...
