Unit 8 知识重点2022-2023学年人教版八年级英语下册

8单元知识点 (一) 现在完成时语法点 1. 现在完成时：表示从过去某一时刻开始并一直延续到现在的动作或事情,但动作或事情现在已经结束。 现在完成时的构成：助动词have (has)+过去分词done 时间状语：already,yet,ever,never,since,for,how long,just,before，so far, recently.twice,many times. 2. already(已经)和yet（还） (1) She has ___ finished reading the book. (2) She hasn’t finished reading the book ___. (3) Has she finished reading the book ____? 3. ever（曾经） 和never（从来没有） (1) I have____ seen this film. (2) Have you _____been to the USA ? (3) Is he famous ?I have ____ heard of him . 4. since+ 具体时间/(一般过去时的句子) for+ 一段时间 （1）The woman has worked at this school ____ 2 years.( =____ two years ago) （2） They’ve known each other _______1995 . （3） I’ve been interested in Chinese ______last year . (4) She has been a doctor ______ one hour. (5) I_____ _____(have) a headache since I ___ (get) up this morning. 5. just 刚刚 （句中） before 以前 （句末） I have just bought a novel。 Ｉhave never read this kind of books before. 6.have/has gone to 已经去了（还没回来，有可能还在路上） have/has been to 已经去过（去了已经回来了） have/has been in 在某地待了多长时间 （1）My aunt isn’t here.She___________ Shanghai on business. （2）.I______________Mount Tai before. （3）.She___________ China for many years. （4）.I ____________ the zoo a lot of times. （5）.He ___________the library.He will come back soon. 7.当句中有since, for ,how long 的时候，非延续性动词要转换 buy____________ leave_____________ come____________ become__________ borrow____________ buy___________ begin (start)__________ open__________ die___________ leave___________ come____________ join have/has been a member/have/has been in 8.一般过去时态和现在完成时态同义转换 (1) We bought the book three years ago. We have _____ the book (_____ three years.)=(_____three years ago.) (2) I borrowed the book a week ago I have _____ the book ____ a week (3)I became a student two years ago. I have _____a student _____over two years. (4) Mr Black died three years ago. Mr Black has ____ _____ _____ three years ago. (5) I came here only a few minutes ago. I ___ ____ here ___ o