8年级英语现在完成时态课件1.pptVIP

Present Perfect Tense;导入： Find out which sentences are past tense and which sentences are present perfect tense . 找出下列哪些句子是过去式，哪些是现在完成时态。;Present perfect tense 现在完成时 ;用法二： for+段时间 since+点时间 since+句子（过去时） E.g. Kate has lived here for 3 years. Kate has lived here since 3 years ago. Kate has lived here since she came to China. ;1.都表示过去发生的事 2.现在完成时强调过去和现在的联系，不能和具体的时间状语连用； 3.一般过去时强调过去发生的事或状态与表示过去的具体时间连用（last, ago, yesterday, etc. ）;A．现在完成时态是一个属于现在时态的范畴，所以它可以和包括“现在时刻”在内的时间状语连用。如：Now, today, this morning / week / month / year, by now, so far, up to now, already, before, just, ever, never, always, recently, lately.等等。如： I have done nothing today. 我今天什么事情也没有干。 We have had four lessons this morning. 今天上午我们上了四节课。 （说话时还没有超出上午的范围） 　　;B．当强调行为的行为时间、执行者、行为方式、行为场所、行为原因时，句中一般用一般过去时，而不用或者很少用现在完成时，间或用现在完成时也是为了强调结果。如：Who did it??? How did he do it?? Why did he do it? Where did he do it? When did he do it? ;C.非延续性动词的否定式可以和表示一段时间的时间状语连用，表示这种动作的否定状态的延续。如： I haven’t bought anything for a week / since you left. 我已经有一个礼拜没有买东西了。/自从你离开以后我没有买过任何东西。;D．为了准确地判断动词的延续性和非延续性，请记住下面的歌诀： 动词延续非延续，要用“一直”加动词； 说得通是延续动词，说不通是非延续动词。 可以说：一直有have/进行be on/保管keep/在……组织里be in/是……成员be a＋身份 不能说：一直买buy/开始begin/借入borrow/到达reach, get to, arrive/参加join,等等。 ;常见非延续性动词和延续性动词的转变;Exercises ;重点句型:It is/ has been+段时间+since从句 段时间+has passed+ since从句;1. 这本书我借了一个月了。;Exercises ;Correcting ;练习 将下列句子翻译成英文。 　　1. 从两点钟起我就在这里了。 　　2. 她已经走了一个礼拜了。 　　3. 从上礼拜五他就生病了。 　　4. 他参军已经有五年了。 　　5. 自从五年前他就在这里了。 ? ; 答案： 1.I have been here since two o’clock. 2.she has been away for two weeks. 3.He has been ill since last Friday. 4. He has been in the army for five years. 5.He has been here since five years ago.