Unit 3,Unit 3 Online tours,Grammar,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.,Learning targets,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.,is famous for,good place to go,heard of three days ago,has worked since,dream vi.& vt. 做梦，梦想 dream about/of 想象；梦想 e.g. Do you 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。,New words,passport n. 护照,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.,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.,Presentation,1. 三年前他养了只猫做宠物。 He _ a cat as pet three years ago. 2. 这只宠物猫他养了三年了。 He _ the pet cat for three years.,kept,has kept,Exercises,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.),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.,Presentation,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.,visited,have visited,Exercises,吴老师2010年和2011年访问过加拿大。 Mr Wu visited Canada in 2010 and 2011. 吴老师已经去过加拿大两次。 Mr Wu has been to Canada twice.,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.,Presentation,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.,saw,have seen,Exercises,Simon is showing Millie some pictures. Complete his 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.,visited,climbed,_ you ever _ (try) the famous Tianjin Baozi?,I am happy that I _ (learn) to swim.,Have tried,have learnt,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.,has already written,have just finished,wrote,finished,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.,was,lived,have lived,haven not been,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?,Have you ever been,have been,did you go,spent,Do you like,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.,had,visited,ate,have never been,Millie is writing about the USA in her diary. Complete her diary entry with the correct forms of the verbs in the box.,Saturday, 15 March Have 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.,showed,have seen,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.,have been,bought,have read,has,returned,We often use these time expressions with the simple past tense: yesterday the other day last. .ago,We often use these time expressions with the present perfect tense: already up to now ever until/till now just so far recently (not) yet,Tips:,some day 和 the other day 的区别：,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.