2017_2018学年八年级英语下册Unit3Onlinetours第5课时课件牛津版.pptx

8B Unit3 Online tours (Grammar2) Leaning aims. 1.To learn differences between Simple past tense and Present perfect tense. Complete Part A and Part B on page 41 and underline the different time expressions. 2.To learn different time expressions between the Simple past tense and the Present perfect tense. Guide One (8) Please write the words ,then recite them within 2 minutes. esterday, the other day, last , ago, just now. already, ever, just, recently, yet, so far, up to now, till now, for , since, in the past/last ten years. Have a match! Who can do it best? 点拨：一般过去时的用法 概念：过去某个时间里发生的动作或状态；过去习惯性、经常性的动作、行 为。 基本构成：主语+动词（包括be）的过去时 常用的时间状语：yesterday, last week, an hour ago, the other day, in 1982等 具体时间状语。 【注】不论是否定句还是一般疑问句，只要用了助动词，原句中的谓语动词的 过去时都要还原成动词原形；主+系+表结构的句子，主语要和was和were在人 称和数上保持一致。 表示过去某一时刻或某段时间发生的动作或者存在的状态。常与表示过去的时 间状语连用。例如：I lived here 5 years ago. 表示在过去一段时间内，经常性或习惯性的动作。例如： When I was a child, I often played football in the street. 一般过去时的形式有时并不表示过去的动作而是只表示说话人的委婉语气。例 如：could you tell me your name? 现在完成时与一般过去时的用法比较 现在完成时的构成 概念：过去发生或已经完成的动作对现在造成的影响或结 果，或从过去已经开始，持续到现在的动作或状态。 基本结构：主语+have/has+过去分词 否定形式：主语+have/has+not+过去分词 常用的时间状语：now,today, tonight, this week, this year, already, yet, just, since, recently,in the past few years等等 Who can recite ? (lets Ss recite for the others) Guide Two” Please look at Grammar B and finish it within five minutes. Have a match! Who can do it best? Class Exercise(-) True or False(请改正) (1) He has gone to the cinema since last night. (2) He has seen many great films. (3) My grandfather has died for two years. (4) They have been in Britain since 1998. (5) We have left our school since two years ago. Class Exercise(二） Use the correct forms of the verbs in brackets. 1.The old man _(live) here since 1992. 2._ you _(visit) our factory yet? 3. I _ (not see) you for a long time. You _(change) a lot. 4. Im afraid I _(keep) you waiting for such a long time. 5. He _(know) the city since he was very youn