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.完成句子。 1. 北京因万里长长城而著名。Beijing _ the Great Wall. 2. 这这条河是个钓鱼钓鱼 的好地方。This river is a _ fishing. 3. 我三天前听说过这说过这 件事。I _ this _. 4.自从2000年起，他就在上海工作了。He _ in Shanghai _ 2000.is famous forgood place to goheard of three days agohas worked sincedream vi.& vt. 做梦，梦想 dream about/of 想象；梦想 e.g. Do you often dream at night?你在夜里经经常做梦吗吗？I sometimes dream about my parents.我有时时梦见见我的父母。I dream of becoming a teacher.我一心想当个教师师。passport n. 护护照Daniel 两年前去了北京。 Daniel went to Beijing two years ago.Daniel 已经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.1. 三年前他养了只猫做宠宠物。He _ a cat as pet three years ago. 2. 这这只宠宠物猫他养了三年了。He _ the pet cat for three years.kepthas keptDaniel 上个月买买了台新电脑电脑 。 Daniel bought a new computer last month.Daniel已经买经买 了台新电脑电脑 。 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.1. 我上个星期去参观观了那个新动动物园。I _ that new zoo last week. 2. 我已经经参观过观过 那个新动动物园了。I _ that new zoo.visitedhave visited吴老师师2010年和2011年访问过访问过 加拿大 。 Mr Wu visited Canada in 2010 and 2011.吴老师师已经经去过过加拿大两次。 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.1. 我上周看过这过这 部电电影。I _ this movie last week. 2. 我已经经看过这过这 部电电影很多次。I _ this movie many times.sawhave seenSimon 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.visitedclimbed_ you ever _ (try) the famous Tianjin Baozi?I am happy that I _ (learn) to swim.Have triedhave learntMr 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 writtenhave just finishedwrotefinished3. 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.waslivedhave livedhaven not beenMillie 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 beenhave beendid you gospentDo you likeSimon: 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 visitedate have never beenMillie is writing about the USA in her diary. Complete her diary entry with the correct forms of the verbs in the box.be buy read return see showSaturday, 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.showedhave seenLast 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.be buy read return see showhave beenboughthave read has returnedWe often use these time expressions with the simple past tense:yesterdaythe other daylast.agoWe often use these time expressions with the present perfect tense: already up to nowever until/till now just so farrecently (not) yet Tips:some day 和