Unit3知识点 Grammar语法 2025-2026学年译林版八年级英语下册

八年级英语下册Unit3知识点-Grammar语法 学习目标 1. 理解一般过去时和现在完成时的基本用法。 2. 掌握两种时态的区别：一般过去时强调过去发生的事，与现在无关；现在完成时强调过去动作对现在的影响或结果，或动作持续到现在。 3. 能正确区分并使用不同的时间状语。 4. 能在具体语境中正确选用一般过去时或现在完成时。 一、一般过去时与现在完成时的区别 一般过去时和现在完成时都可以表示过去发生的动作，但它们在用法上有明显的区别。 1. 一般过去时 用法：表示过去某个时间发生的事情或存在的状态，强调动作发生在过去，与现在没有直接联系。常与表示过去的时间状语连用。 例句： - I went to Beijing last month. （我上个月去了北京。）（只是陈述过去的事实） - Tom was in China in 2022. （汤姆2022年在中国。） 2. 现在完成时 用法：表示到说话时为止已经发生或完成的动作，强调对现在造成的结果或影响；或者表示从过去开始一直持续到现在的动作或状态。常与频度副词或表示一段时间的状语连用。 例句： - I have bought a new mobile phone. （我买了一部新手机。）（强调现在有新手机用了） - I have been to Jingdezhen many times. （我去过景德镇很多次。）（强调对景德镇熟悉） 请补全下列规则： - 一般过去时通常与表示________的时间状语连用，如 yesterday, last week, two years ago, just now, in 2022等。 - 现在完成时通常和________或表示________的状语连用，如 many times, never, these days, this week, since..., for...等。 二、用法对比总结 时态 用法要点 例句 一般过去时 过去发生的动作或状态，时间已结束，与现在无关。 My family moved to Liverpool two years ago. 现在完成时 1. 过去发生的动作对现在有影响或结果； 2. 过去开始的动作持续到现在； 3. 表示到目前为止动作发生的次数。 We have lived in a small flat since we arrived. My dad has been to China three times. 根据提示，完成下列规则（用“一般过去时”或“现在完成时”填空）： - 我们用 ________ 来描述过去发生的事情，动作发生的时间已结束。 - 我们用 ________ 来谈论： - 一个从过去开始并持续到现在的动作； - 一个动作的结果； - 一个动作到目前为止发生的次数。 三、时间状语对比 一般过去时常用时间状语 现在完成时常用时间状语 yesterday, last week, ... ago, in 2022, just now already, yet, ever, never, just, recently, so far, many times, since..., for... 请判断下列时间状语应使用时态： 1. last month → ________ 2. since 2020 → ________ 3. two days ago → ________ 4. so far → ________ 5. just now → ________ 6. already → ________ 四、配套练习 A. 单项选择 ( ) 1. I _______ a new bike yesterday.  A. have bought B. bought C. buy D. was bought ( ) 2. She _______ to Shanghai twice.  A. has been B. went C. goes D. have gone ( ) 3. My father _______ to Beijing last month. He is still there.  A. has gone B. went C. has been D. goes ( ) 4. We _______ each other since we were children.  A. know B. have known C. knew D. are knowing ( ) 5. — _______ you ever _______ the Great Wall? — Yes, I _______ it last year.  A. Have; visited; visited B. Did; visit; have visited C. Have; visited; have visited D. Did; visit; visited B. 用所给动词的正确形式填空（注意时态） 1. I ________ (finish) my homework an hour ago. 2. They ________ (live) here since 2018. 3. She ________ (never, see) such a beautiful sunset before. 4. He ________ (go) to the library just now. 5. We ________ (already, visit) three museums this month. C. 根据上下文，用括号内动词的正确形式填空 Simon and Millie are talking about online visits. Complete their conversation. Millie: Hi, Simon. Some museums offer online tours. (1) ______ you ever ______ (try) one of them? Simon: Yes. I (2) ______ (visit) the Shaanxi History Museum last weekend. And I also visited the Digital Dunhuang website. I (3) ______ (see) ten caves on it so far. Millie: Nice! I (4) ______ (visit) the website of the Hangzhou Arts and Crafts Museum yesterday. Besides local arts, there are some online games for teenagers. I (5) ______ (play) one six times so far. It’s interesting! Simon: Online museums are really great! My friend Neil lives in the UK. He hasn’t been to China in person, but he (6) ______ (visit) the Palace Museum online many times. So far, he (7) ______ (learn) a lot about the museum. D. 用所给动词的正确形式完成句子 1. Last month, I ________ (introduce) some online museums to my friend Neil. He ________ (visit) three of them so far. 2. I ________ (collect) two pages of information from the website so far. My sister ________ (sign) up for a course yesterday. 3. I ________ (visit) Digital Dunhuang three times. My brother ________ (not visit) it yet. 4. Dad ________ (decide) that we should visit Chengdu first. Yesterday he ________ (make) a list of places. 5. They ________ (be) to China twice. They ________ (go) there in 2019 and 2022. E. 翻译句子 1. 我去年去过北京。 → I ________ ________ Beijing last year. 2. 我从未吃过北京烤鸭。 → I ________ ________ ________ Beijing duck. 3. 他已经完成了作业。 → He ________ ________ his homework. 4. 你见过这部电影吗？——是的，我昨天看的。 → ________ you ever ________ this film? — Yes, I ________ it yesterday. 参考答案 A. 单项选择 1. B（yesterday 是一般过去时标志） 2. A（twice 表示次数，用现在完成时） 3. B 4. B（since 用现在完成时） 5. A（第一空现在完成时，第二空一般过去时） B. 动词填空 1. finished 2. have lived 3. has never seen 4. went 5. have already visited C. 对话填空 1. Have; tried 2. visited 3. have seen 4. visited 5. have played 6. has visited 7. has learned D. 完成句子 1. introduced; has visited 2. have collected; signed 3. have visited; hasn't visited 4. has decided; made 5. have been; went E. 翻译 1. went to 2. have never eaten 3. has finished 4. Have; seen; saw 1 学科网（北京）股份有限公司 $