八年级英语新目标下现在完成时态课件.ppt

e g. You have learnt/ed English for over three years. Mrs luo has taught Chinese for about 30 years. He has done his homework for an hour. (2)since+时间点/具体的过去时间 e g. You have learned English since 2003. * The Present Perfect Tense( 现在完成时态 ) . .现在完成时态的构成: have/has+过去分词! 现在完成时的基本用法 (一)现在完成时表示过去某时发生的动作到说话时已经完成,对现在产生的影响或结果。 可用一个一般过去时和一个一般现在解释。 She has had lunch. She is full now.(现在的情况) She had it an hour ago.（过去的动作） （现在完成时把过去的动作和现在联系起来并着眼于现在） eg: 这种用法一般不带明显的时间状语,但可以already ,yet, just, once, twice等副词用 He has been in the army for ten years. He has lived here since 1977. He has lived here for 29 years. (二)未完成用法。表示动作或状态开始于 过去， 一直延续到现在，这个动作并未结束还会继续延续下去。这种用法一般可以与表示延续性的时间壮语连用,如 (1)for+数词+时间名词 B:since+S(主）+V-ed+others. You have learnt English since you came to No.1Middle School. 从上面的句子可以得出：现在完成时的第二种用法的两种时间状语可以转换，同时还可与一般现在时和一般过去时进行转换. He has lived here for 29 years. 1977 now 常用的时间状语： since…, for…, all one’s life in the past/last few years, so far,. for 和since的运用对比: for: +一段时间 for two weeks for three years since 过去的某一时刻 since then since last month 一般过去时态的时间状语从句 since she left 注意:for 和since 所引导的时间状语都表示一段时间. He has been away for a week. He has been away since last week. 对划线部分提问都用How long She has ever been to Beijing. (现在已不在北京，从结果上和现在联系起来） 3.Special usage: a.要表示某人曾去过某处，或去过某处多少次。要用have/has been to +a place b.要表示某人一直在某处。 She has been in Beijing for two years. （现在仍在北京，从时间上和现在联系起来） I have been in this town since 1977. c. 要表示某人到某地去了。即说话人不在说话的地点。 He has gone to Shanghai. 他已经去了上海。 Ex: Say “W”or “R” to the following sentences。 You have gone to Shanghai.