Unit12SectionAGrammarFocus-4c课件人教版九年级英语全册.pptxVIP

Unit 12 Life is full of the unexpectedSection A Grammar focus -4c1.Learn about past perfect tense.2.Review of key structures.3.能正确使用由when,before,as,by the time 引导的时间状语从句表示过去发生的事情，复习一般过去时态。Learning aimsGrammar focus把下列句子分类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.第一类：第二类：Grammar focusDiscuss with your partner!1、为什么主句和从句分别使用过去完成时态？2、在使用不同时态时从句和主句的先后顺序？When he came in, the students stood up.When the baby saw her mother, she stopped crying He was about to watch a movie when his parents knocked at the door.They were about to get on the bus when they heard someone shout. As I was standing in front of the teachers’ office, I saw a boy fight with another boy.. As he was doing housework, a bird flew into the kitchen.Q1：在以上时间状语从句中，主句和从句的动作是先后发生，还是同时发生？Q2：主从句都使用过去时态的时间状语从句的引导词有什么？Answers:1.在以上的时间状语从句中，主句和从句的动作都是同时发生，或者在进行一个动作时，另一个动作突然发生。2.主句和从句都用过去时态的时间状语从句引导词有when, as等●When I got up, I found that my brother had already taken a bath in the bathroom,●When she got to the check-out, she realized she had left her purse at home.●Before I arrived at the airport, the plane had already taken off.●They had already had breakfast before they got to the hotel.●Most of the guests had left by the time he arrived at the party.●The film had already begun by the time I got to the cinema.过去完成时的结构？过去完成时的结构：“助动词had+动词的过去分词”Grammar focus●When I got up, I found that my brother had already taken a bath in the bathroom,●When she got to the check-out, she realized she had left her purse at home.●Before I arrived at the airport, the plane had already taken off.●They had already had breakfast before they got to the hotel.●Most of the guests had left by the time he arrived at the party.●The film had already begun by the ti