Unit 3 The world at one click Grammar课件2025-2026学年译林版八年级英语下册

该初中英语课件聚焦一般过去时与现在完成时的用法及区别，通过歌曲导入激活兴趣，结合例句对比（如“last September”与“since last September”）构建学习支架，帮助学生梳理从复习旧知到辨析差异的知识脉络。 其亮点在于以“呈现-练习-产出”为主线，通过翻译、填空等练习提升语言能力，借助自我评估和思维导图作业培养学习能力。实例中选择题强化时间标志辨析，话题讨论促进时态灵活运用，助力学生精准掌握语法，教师可通过系统设计提升教学效率。

Unit 3 The world at one click Grammar To review the uses of simple past tense and the uses of present perfect tense.（学习理解） 01 To tell the differences between the simple past tense and the present perfect tense.（应用实践） 02 To be able to make up some sentences using the simple past tense and the present perfect tense.（迁移创新） 03 教学目标 Practice Make two sentences according to the first difference. Sentence 1: He went to the factory last September. Sentence 2: He has worked in the factory since last September. Presentation Read the second difference and answer the questions. What does the first sentence tell us? It tells us what happened in the past and the action is finished. Presentation Read the second difference and answer the questions. What does the second sentence tell us? It tells us the result of an action which happened in the past. Practice Make two sentences according to the second difference. Sentence 1: He studied in the school five years ago. Sentence 2: He has already finished his studies at this school. Let’s enjoy Have you ever heard of this song? Simple past tense (一般过去时) Present perfect tense （现在完成时） Presentation Read the third difference and answer the questions. What does the first sentence tell us? It tells us what happened in the past.  Presentation Read the third difference and answer the questions. What does the second sentence tell? It tells us how many times the action has happened up to the present. Practice: Finish Part B on page 42 B Some students are talking about online tours.Complete their sentences with thecorrect forms of the words in brackets. 1 Simon:Last month,I__ ______(introduce)some online museums to myfriend Neil in the UK.He_______ (visit)three of the museums so far. 2 Amy: I_____ (collect)two pages of information from the website ofthe Water Cube so far. My sister Shirley_________ (sign)up for a swimming trainingcourse on its website yesterday. 3 Kitty: I_______ (visit)Shanghai Ballet online last Saturday.They___________(put)a list of different shows on the websiterecently. 4 Millie: I______ (visit)Digital Dunhuang three times.My brother Andy_______ (not visit)it yet. 5 Daniel:I________(write)a report about online tours yesterday.I_________(send)the report to Mr Wu already. introduced has visited have collected signed visited have put have visited hasn’t visited wrote have sent decided has booked made has been told Further thinking: What’s the reason for not using the simple past tense? the result of an action Practice: Finish Part C on page 42 Read and work out What do the sentences tell us? 描述过去的动作，且该动作的时间（已经结束）。 It tells us that the action happened in the past and the action is over. It tells us that the action started in the past and continues to the present. It lasts for a period of time. 谈论始于过去并持续到现在的动作。 Practice Translate into Chinese 1. 他于去年9月去了工厂。 2. 他自去年9月起便在这家工厂工作。 He went to the factory last September. He has worked at the factory since last September. Production: Talk about an online trip or a real trip Tips: Pay attention to choosing the right tense Your online/real trip number of people what to see what to do food culture music ... 课堂练习 答案：C 解析：watered。时间状语“yesterday”明确指向一般过去时，描述过去特定时间发生的动作（浇水）。选项B（现在完成时）强调对现在的影响，与句意不符。 1. — Peter, did you play table tennis with friends after school yesterday? — No, I didn't. We ______ vegetables in our school garden. A. water B. have watered C. watered D. are watering 课堂练习 答案：A 解析：have seen。“so far（迄今为止）”是现在完成时标志词，强调动作从过去持续至今并可能继续（已看三次）。选项B（一般过去时）仅表示过去动作，无延续性。 2. The film Ne Zha 2 is worth seeing. I ______ it three times so far. A. have seen B. saw C. will see D. see 课堂练习 答案：B 解析：watched “last weekend”指明动作发生在过去特定时间（上周末），需用一般过去时。选项C（现在完成时）需搭配无具体时间或延续性状语（如already, since）。 3. After signing up for the online course, Amy ______ all the training videos last weekend. A. watches B. watched C. has watched D. will watch Read and work out What do the sentences tell us? It tells us what happened in the past and the action is finished. It tells us the result of an action which happened in the past. 谈论发生在过去动作的结果。 描述过去发生的事情，状态已结束。 Read and work out What do the sentences tell us? It tells us what happened in the past. It tells us how many times the action has happened till now. 用一般过去时描述过去发生的事情。 用现在完成时描述到目前为止一个动作发生了多少次。 Work out the rules simple past tense present perfect tense 一般过去时 描述过去发生的事情 现在完成时 始于过去并持续到现在的动作 动作的结果 到目前为止一个动作发生了多少次 1. He studied at the school five years ago. 2. He has already finished his studies at this school. Practice 一、Translate into English 他五年前曾在这所学校就读。 他已在这所学校完成了学业。 ( ) 1. — Mary, ______ you _______ supper yet? — Yes. I was not hungry, so I just ate a vegetable salad. A. did; have B. will; have C. were; having D. have; had ( ) 2. — How was your family trip last weekend? — Awful! We _________ wet through because of a sudden rain. A. get B. have got C. got D. are getting ( ) 3. — What do you think of the cartoon Tom and Jerry? — It is so interesting that I _______ it many times. A. was watching B. have watched C. will watch D. am watching D C B 二. 选择题 三. 按要求完成下列句子。 1. Kate’s brother has been married for two years. (改为同义句) Kate’s brother ________ ______ ______ ________. 2. The train left the station half an hour ago. (改为同义句) The train ______ ______ ______ _______ the station for half an hour. 3. My mother has worked in the factory for sixteen years. (对画线部分提问) 　_____ ____ _____ your mother _______ in the factory? married two years ago has been away from How long has worked 4. Uncle Li has been to Shanghai on business twice. (对画线部分提问)　　　　 　　　　 　　　　 　　　　 _______ _____ _______ ______ Uncle Li ________ to Shanghai on business? 5. Judy went jogging in the park this morning. (对画线部分提问) ________ ________ Judy __________ jogging in the park? How many times has been When did go Can you tell the differences between the simple past and present perfect tenses? Can you use the simple past and present perfect tenses correctly? 1. Draw a mind map about the present perfect tense according to what you’ve learnt from Unit 1 to Unit 3. 2. Preview Integration on pages 43-46. $