Module4 Unit3课件 2023-2024学年外研版八年级英语下册

Module 4 Seeing the doctor Unit 3 Language in use Present perfect (3) Focus on 用法 for 和 since 在现在完成时中的用法 1. - How long have you been like this? (P26) - _ Friday. I've been ill _ about three days! 2. I haven't done much exercise _ I got my computer last year. (P26) 3. I have had him _ three months now. (P28) 4. _ then, it has become part of my life. (P28) Fill in the blanks and observe the sentences. Since for since for Since 要表达某一行为或状态从过去某时间一直持续到现在,可以使用现在完成时。现在完成时通常要与表示一段时间的时间状语连用,这类状语通常由for和since引导。 ① Lily has learned English _. ② Lily has learned English _. present future past learned English five years ago Complete the sentences according to the picture. for five years since five years ago for+段时间 since+点时间 since和for加时间的用法: since: 自……以来 ① He has lived here since 5 o'clock yesterday. ② Judy has stayed here since 5 hours ago. ③ She has taught English since he came here. since+从句 (动词用过去时) since+过去的点时间 since+段时间+ago for: 长达 He has kept the book for 2 weeks. for+段时间 1. How long have you played football? 2. How long have you been like this? 3. How long have you had the dog? 在对现在完成时的时间状语进行提问时,我们常用_。 这些动词都是延续性动词。 你踢足球踢了多长时间了? 你这个样子有多久了? 这条狗你养了多久了? how long 观察句中动词,你能发现什么? 延续性动词表示能持续一段时间的动作或表示状态的词,如work,stay,live,learn等。 非延续性动词表示短暂的动作,从开始到结束,几乎同时或在极短的时间里就完成,如come,go,leave,start,begin,become,receive,die等。 1. 延续性动词与非延续性动词的定义 延续性动词与非延续性动词 Look at these two sentences. Do you think they are right or wrong? 1 I have bought this book for 3 years. 2 I have bought this book since 3 years ago. 3 He has died for three years. 非延续性动词表示的动作极其短暂,不能持续。因此,在现在完成时肯定句中不可与表示一段时间的状语连用,应改用延续性动词。 1 I have had this book for 3 years. 2 I have had this book since 3 years ago. 3 He has been died for 3 years. Look at these two sentences. Do you think they are right or wrong? 1 I haven't heard from him for a year. 2 I haven't heard from him since March. 在现在完成时否定句中,因为非延续性动词的“非延续性”被否定,成为可以延续的状态,因而可与表示一段时间的状语连用,说明某个动作一直没发生。 ① 用相应的延续性动词替换句中的非延续性动词,如: 非延续性动词转换为表持续的动词或者表状态的短语后即可在现在完成时中与表示一段时间的状语连用。 2. 延续性动词与