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Unit 3 Online toursThe Fourth PeriodGrammarTeaching aims:1. To understand the differences between the simple past tense and the present perfect tense.2. To grasp the expressions with the present perfect tense.3. To grasp the expressions with the simple past tense.4. To understand different uses of the present perfect tense.Teaching Steps:Step 1 Revision完成句子。1. 北京因萬(wàn)里長(zhǎng)城而著名。Beijing _ the Great Wall.2. 這條河是個(gè)釣魚(yú)的好地方。This river is a _ fishing.3.我三天前聽(tīng)說(shuō)過(guò)這件事。I _ this _.4. 自從2000年起,他就在上海工作了。 He _ in Shanghai _ 2000.Step 2 PresatationTeach the new words.dream vi.& vt. 做夢(mèng),夢(mèng)想dream about/of 想象;夢(mèng)想e.g. Do you often dream at night? 你在夜里經(jīng)常做夢(mèng)嗎? I sometimes dream about my parents. 我有時(shí)夢(mèng)見(jiàn)我的父母。I dream of becoming a teacher. 我一心想當(dāng)個(gè)教師。Step 3 Grammar explanationTranslate some sentences.Daniel 兩年前去了北京。(Daniel went to Beijing two years ago.)Daniel 已經(jīng)在北京居住兩年了。(Daniel has lived in Beijing for two years.)Tell the students the difference between the simple past tense and the present perfect tense.Difference: We use simple past tense to tell what happened in the past.We use the present perfect tense to talk about an action that started in the past and continues to the present.Exercises:1. 三年前他養(yǎng)了只貓做寵物。He _ a cat as pet three years ago.2.這只寵物貓他養(yǎng)了三年了。He _ the pet cat for three years.Daniel 上個(gè)月買了臺(tái)新電腦。Daniel bought a new computer last month.Daniel已經(jīng)買了臺(tái)新電腦。Daniel has bought a new computer.(Daniel has a new computer now.)Differences:We use the simple past tense to tell what happened in the past.We use the present perfect tense to talk about the result of an action.When the action happened is not very important. It may have just happened or happened some time ago.Exercises:1. 我上個(gè)星期去參觀了那個(gè)新動(dòng)物園。I _ that new zoo last week.2. 我已經(jīng)參觀過(guò)那個(gè)新動(dòng)物園了。I _ that new zoo.吳老師2020年和2020年訪問(wèn)過(guò)加拿大。Mr Wu visited Canada in 2020 and 2020.吳老師已經(jīng)去過(guò)加拿大兩次。Mr Wu has been to Canada twice.Differences:We use the simple past tense to tell what happened in the past.We use the present perfect tense to tell how many times an action has happened till now.Exercises:1. 我上周看過(guò)這部電影。I _ this movie last week.2. 我已經(jīng)看過(guò)這部電影很多次。I _ this movie many times.Step 4 ExercisesA. Amy is showing Millie some pictures. Complete her sentences with the correct forms of the words in brackets.I_(visit) the Palace Museum with my grandparents the other day.I _(climb) Mount Huang last Summer._ you_(try) the famous Tianjin Baozi?I am happy that I _ (learn) to swim.B. Mr Wu is asking the students to make sentences with the correct tenses. Help them complete the sentences with the correct forms of the words in brackets.1. I _(finish/ just) my homework. Millie _(finish) her homework 20 minutes ago.2. I _(write) an email to my friend yesterday. Daniel _ (write/ already) two emails.3. I _(be) in Hainan last week. Some of our classmates _ (not be) to Hainan yet.4. I _(live) in Sunshine Town since I was born. Daniel _(live) in Nanjing in 2020.C. Millie has never been to Nanjing. She is asking Simon about the city. Complete their conversation with the correct forms of the words in brackets.Millie: _ (you/be/ever) to Nanjing?Simon: Yes. I(2)_(be) there three times.Millie: When (3)_ (you/go) there last?Simon: Last summer. I (4)_(spend) a week there.Millie: (5)_ (you/like) it?Simon: Oh yes. I (6)_(have) a great time there. I (7)_(visit) many places of interest and (8)_(eat) lots of local food.Millie: Lucky you! I (9)_ (be/never) there.D. Millie is writing about the USA in her diary. Help her complete her diary entry with the correct forms of the verbs in the box.Saturday, 15 MarchHave you ever dreamt of travelling around the world without a passport? Yes, you can realize your dream by taking an online tour. Yesterday Danniel (1)_ me an online tour of the USA. I (2)_ never _ so many wonderful pictrues before.Last week, I (3)_ a book about the places of interest in the USA. I (4)_ 20 pages already. Its really interesting. My dad (5)_ just _ from the USA, but I (6) _ never_ there. I hope I can visit the USA some day.Step 5 Notice1.We often use these time expressions with the present perfect tense:already up to now ever until/till now just so far recently (not) yet2. some day 和 the other day 的區(qū)別:the other day 相當(dāng)于a few days ago,意為“幾天前、某天、那天、不久前”,句中用一般過(guò)去時(shí)。如: I met her in the street the other day.幾天前我在街上碰見(jiàn)過(guò)她。 I bought the watch the other day.這手表我是幾天前買的。some day指將來(lái)“總有一天、有朝一日、終將、(日后)某一天”,謂語(yǔ)動(dòng)詞用一般將來(lái)時(shí).如: Your wishes will come true some day.總有一天你的愿望會(huì)實(shí)現(xiàn)的。 Some day youll have to pay for what you have done. 總有一天你要為你的行為而付出代價(jià)的。Step 6 Summary 1) 一般過(guò)去時(shí)表示過(guò)去某時(shí)發(fā)生的動(dòng)作或單純敘述過(guò)去的事情,強(qiáng)調(diào)動(dòng)作;現(xiàn)在完成時(shí)為過(guò)去發(fā)生的,強(qiáng)調(diào)過(guò)去的事情對(duì)現(xiàn)在的影響,強(qiáng)調(diào)的是影響。2) 一般過(guò)去時(shí)常與具體的時(shí)間狀語(yǔ)連用,而現(xiàn)在完成時(shí)通常與模糊的時(shí)間狀語(yǔ)連用,或無(wú)時(shí)間狀語(yǔ)。一般過(guò)去時(shí)的時(shí)間狀語(yǔ):yesterday, last week,ago, in1980, in October, just, now等,皆為具體的時(shí)間狀語(yǔ)?,F(xiàn)在完成時(shí)的時(shí)間狀語(yǔ):for, since, so far, ever, never, just, yet, till/until, up to now, in past years, always等,皆不確定的時(shí)間狀語(yǔ)。共同的時(shí)間狀語(yǔ):this morning, tonight, this April, now, already, recently, lately 等。3) 現(xiàn)在完成時(shí)可表示持續(xù)到現(xiàn)在的動(dòng)作或狀態(tài),動(dòng)詞一般是延續(xù)性的,如live, teach, learn, work, study, know。一般過(guò)去時(shí)常用的非持續(xù)性動(dòng)詞有come, go, leave, start, die, finish, become, get married等。句子中如有過(guò)去時(shí)的時(shí)間副詞(如yesterday, last, week, in 1960)時(shí),不能使用現(xiàn)在完成時(shí),要用過(guò)去時(shí)。(錯(cuò))Tom has written a letter to his parents last night.(對(duì))Tom wrote a letter to his parents last night.Step 7 Exercises1. Mother _me a new coat yesterday. I _ it on. It fits me well. A. had madehave tried B. madehave tried C. has madetried D. madetried 2. We _ trees last Sunday. So far we _ o

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