Unit 1 Grammar（精品课件）2021-2022学年八年级下册初二英语【课时A计划】牛津译林版（安徽）

Unit 1 Past and present The Present Perfect Tense 现在完成时 Grammar Learning aims: 1. Master the structure and basic usage of present perfect tense (PPT). （掌握现在完成时的用法、基本结构。） 2. Master the rules of forming the past participle of verbs. （掌握动词的过去分词变化规则。） 3. Master some time expressions usually used in present perfect tense ( PPT). （掌握常用在现在完成时里的时间表达方式。） I wrote some words on the blackboard just now. There are some words on the blackboard now. I have written some words on the blackboard already. (现在完成时) Task1.现在完成时的主要用法 （合并为一句） 现在完成时的用法(一) 1.表示过去发生的动作对现在造成的影响或结果。 wrote some words on the Bb The words are on the Bb Now Past 现在完成时的用法(二) I have been a teacher since I left my college(大学). I became a teacher. I am still a teacher. Now Past Future 2.表示过去已经开始，持续到现在或将来的动作或状态。 I have been a teacher for 20 years. 3.表示某事直到现在发生了多少次. 现在完成时用法(三) I have watched the TV show many times. I have written some words on the Bb already. Task2 (1)现在完成时结构： I have been a teacher since I left my college(大学). Discussion: What new structure can you find in these sentences? I have been a teacher for 12 years. I have watched the TV show many times. —————————— ———————— ——————— __________________ v 过去分词 have / has + We make negative statements in the present perfect tense like this: have not = haven’t has not = hasn’t Task2 现在完成时否定和一般疑问句。 have has not I / You/ We / They opened the door. He / She / It * * Let’s practise not change a lot the students The students ________changed a lot. haven’t =have not Let’s practise Lucy has finished her homework.(否定句) Lucy _____ _____finish her homework. has not =hasn’t Work out the rule 如何变否定句？ 只需要在___________ 后 加上_________ 即可。 have或has not have not= haven’t has not = hasn’t ? We ask and answer questions using the present perfect tense like this: Have Has Yes, No, have. has. haven’t. hasn’t. I / you/ we / they opened the door? he / she / it I / you/ we / they he / she / it I / you/ we / they h