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1、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 t
2、he present perfect tense.Teaching Steps:Step 1 Revision完成句子。1. 北京因万里长城而著名。Beijing _ the Great Wall.2. 这条河是个钓鱼的好地方。This river is a _ fishing.3.我三天前听说过这件事。I _ this _.4. 自从2000年起，他就在上海工作了。 He _ in Shanghai _ 2000.Step 2 PresatationTeach the new words.dream vi.& vt. 做梦，梦想dream about/of 想象；梦想e.g. Do you
3、often dream at night? 你在夜里经常做梦吗？ I sometimes dream about my parents. 我有时梦见我的父母。I dream of becoming a teacher. 我一心想当个教师。Step 3 Grammar explanationTranslate some sentences.Daniel 两年前去了北京。(Daniel went to Beijing two years ago.)Daniel 已经在北京居住两年了。(Daniel has lived in Beijing for two years.)Tell the stude
4、nts 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. 三年前他养了只猫做宠物。He _ a cat as
5、pet three years ago.2.这只宠物猫他养了三年了。He _ the pet cat for three years.Daniel 上个月买了台新电脑。Daniel bought a new computer last month.Daniel已经买了台新电脑。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 pe
6、rfect 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. 我上个星期去参观了那个新动物园。I _ that new zoo last week.2. 我已经参观过那个新动物园了。I _ that new zoo.吴老师2010年和2011年访问过加拿大。Mr Wu visited Canada in 2010 and 2011.吴
7、老师已经去过加拿大两次。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. 我上周看过这部电影。I _ this movie last week.2. 我已经看过这部电影很多次。I _ this movie many times.Step
8、 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
9、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
10、) 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 2007.C. Millie has never been to Nanjing. She is asking Simon about the city. Complete their conversation with the correct forms o
11、f 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
12、 (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, yo
13、u 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,
14、 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 的区别：the other day 相当于a few days ago,意为“几天前、某天、那天、不久前”，句中用一般
15、过去时。如： I met her in the street the other day.几天前我在街上碰见过她。 I bought the watch the other day.这手表我是几天前买的。some day指将来“总有一天、有朝一日、终将、(日后)某一天”，谓语动词用一般将来时.如: Your wishes will come true some day.总有一天你的愿望会实现的。 Some day youll have to pay for what you have done. 总有一天你要为你的行为而付出代价的。Step 6 Summary 1) 一般过去时表示过去某时发生
16、的动作或单纯叙述过去的事情，强调动作；现在完成时为过去发生的，强调过去的事情对现在的影响，强调的是影响。2) 一般过去时常与具体的时间状语连用，而现在完成时通常与模糊的时间状语连用，或无时间状语。一般过去时的时间状语：yesterday, last week，ago, in1980, in October, just, now等，皆为具体的时间状语。现在完成时的时间状语：for, since, so far, ever, never, just, yet, till/until, up to now, in past years, always等，皆不确定的时间状语。共同的时间状语：this
17、morning, tonight, this April, now, already, recently, lately 等。3) 现在完成时可表示持续到现在的动作或状态，动词一般是延续性的，如live, teach, learn, work, study, know。一般过去时常用的非持续性动词有come, go, leave, start, die, finish, become, get married等。句子中如有过去时的时间副词（如yesterday, last, week, in 1960）时，不能使用现在完成时，要用过去时。（错）Tom has written a letter
18、to his parents last night.（对）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 _ over 3,000 trees there. A. planted； planted B. planted； have planted C. have planted； planted D. have planted； have planted 3. I _ the way. I _ here for quite many years. A. knewhave lived B. knewlive C. knowhave lived D. knowlive Step 8 HomeworkFinish off the exercises in workbook.