现在完成时presentperfecttense.pptVIP

请注意以下句型的翻译： It is/has been two years since I worked here. It is /has been many years since I was a nurse. * 现在完成时 (present perfect tense) 构成: have/ has done 定义: 动作发生在过去而对现在产生影响 现在完成时 VS 一般过去时 Tom has had a bad car accident. Tom had a bad car accident. 表示在说话之前已经完成的事情,但依然与现在有关: She has left. We have read the novel. Someone has broken the window. 注意: 这种情况下,可用has/have just done 来强调动作刚刚才完成。 She has just left. We have just read the novel. Someone has just broken the window. 2. 已故伟人的言行也用现在完成时 Shakespeare has written most of the best plays we know. Newton has explained the movements of the moon from the attraction of the earth. 注意: for +时间段 since+时间点 all day/night/week/all the time/ always + non-action verbs lately=recently never, before yet----与否定句或疑问句连用 already----与肯定句连用 + action/non-action verbs 注意: 1. 动词是延续性动词, 可以使用瞬间动词的否定式,表示状态的持续. 他离开这已经有3年了. He _____ here three years ago. He _____ _____ _____ from here for three years. It is three years since he _____ here. left has been away left 他已经两年没给我写信了. He hasn’t written to me for two years. 注意: 2. since 引导的时间状语中, since 后面的时间名词必须是时间点, 而 for 短语中的时间名词必须是一段时间. 从北京回来后他就很忙. 我学英语已经学了多年了. He has been busy since he came back from Beijing. I have learnt English for many years. It is /has been two years since I stopped working here. I left here two years ago. I haven’t worked as a nurse for many years. I stopped working as a nurse many years ago. 3.重复发生的动作发生在尚未结束的时间里,经常有时间状语： today, thismorning/afternoon/evening/week/ month/year/century, how many times/5times,etc eg: Tom has rung up three times this morning. How many times has it happened this year? 用于现在完成时中的时间状语 1.表示包括现在在内的一段时间的时间状语 until now, up to now, up to the present, so far, in/for the last/ past 3 years, recently, today, now, this morning/week/year, etc 2.表示不确定的过去时间状语 already, yet, before 3. 表示频率的时间状语 always, often, never, ever, fi