Unit 12 Section A grammar focus -3d导学案2022-2023学年人教版英语九年级全册

九年级英语上册 Unit12 导学案 课型： 设计： 审核： 审批： 班级： 小组： 姓名： 使用时间： 月 日 星期 Unit 12 Life is full of the unexpected. Section A grammar focus 第四课时 Teaching Objectives 1.To explore the rules of past perfect tense. 2.To work out the rules. 3.To apply the rules. 自学指导 自学检测及课堂展示 Grammar focus 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) 我回到学校的时候，铃声已经响了。 _____ _____ _____ I got back to school, the bell ______ _______. 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) 我正要上楼，这时我决定先去买杯咖啡。 I ______ ______ ______ go up to my office when I decided to get a coffee first. 5) 当我正在和其他的工作人员一起排队等候的时候，我听到了一声巨响。 As I ______ _______ ______ ______ with the other office workers, I ______ _____ _____ ______. Conclusion 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. 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。 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. 两个动作同时进行，主从句都是一般过去时或过去进行时。 过去完成时 1. 过去完成时的构成 过去完成时由“助动词had (用于各种人称和数) + 过去分词”构成 2. 过去完成时的概念 过去完成时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”。 判断句子是否用过去完成时态 首先要确定时间状语，接着判断动作是否已经发生或完成，然后再来判断动作发生的先后顺序。 这个过去的时间可以用by，before等介词短语或者一个时间状语从句来表示，也可用when, before等引导的从句，或者通过上下文表示。 e.g. The movie had started before I arrived at the cinema. 当过去完成时态中含有表示一段时间的状语时，谓语动词常用延续性动词。 e.g. When I arrived at the school gate, all the other girls had been away for 30 minutes. been away表示“离开”，这里不能用“left”。 过去完成时的构成 1. 肯定句式：主语 + had + 动词的过去分词 + 其他. e.g. When I woke up, it had stopped raining. By the time I got to the airport, the plane had taken off. 2. 否定句式：主语 + had not / hadn’t + 动词的过去分词+ 其他. e.g. Julian hadn’t cleaned up the house before his mother got home yesterday afternoon.