新概念英语第二册课件Lesson28现在完成时上课ppt（共21页）

这是一份新概念英语第二册课件Lesson28现在完成时上课ppt（共21页），共19页。PPT课件主要包含了Reading，考点例析等内容，欢迎下载使用。

1. First listen and then answer the questin.
What is Jasper White’s prblem?
Peple ften park their cars utside his gate s that he can’t get his car int his garage.
Are there many peple wh believe in ancient myths?Why can’t he get his wn car int his garage?Hw many ways has he cme up with t slve this prblem? What are they?
Are there many pepe wh believe in ancient myths?
N, there aren’t.
2. Why can’t he get his wn car int his garage?
Because smene has parked a car utside his gate when he cmes hme in the evening.
3. Hw many ways has he cme up with t slve this prblem? What are they?
Tw.The first is t put up “N Parking” signs utside his gate.The secnd is t put an ugly stne head ver the gate.
现在完成时 (Present Perfect)
现在完成时用来表示之前已发生或完成的动作或状态，其结果的确和现在有联系。动作或状态发生在过去　但它的影响现在还存在；也可表示持续到现在的动作或状态。其构成： have (has) +过去分词
比较过去时与现在完成时
1）过去时表示过去某时发生的动作或单纯叙述过去的事情，强调动作； 现在完成时为过去发生的，强调过去的事情对现在的影响，强调的是影响。 I saw this film yesterday. （强调看的动作发生过了。）I have seen this film. （强调对现在的影响，电影的内容已经知道了。）
构成形式： 助动词 have / has+ 过去分词
肯定式：主语+have / has+ 过去分词+其他 I have read the bk twice.
否定式：主语+haven’t / hasn’t+ 过去分词+其他 I haven’t been there befre.
疑问式：Have / Has+主语+ 过去分词+其他？ Have yu finished yur hmewrk?
现在完成时的构成及基本句型
现在完成时的基本用法表示过去发生或已完成的某一个动作对现在造成的影响或结果。 --- Have yu had lunch? --- Yes, I have. I’ve just had it. 你吃过午饭没？有，吃过了，我刚刚吃的。（影响及结果：我现在饱了，不需要了） He has gne t Beijing. 他已经去北京了。（影响及结果：他人现在不在这里了）
(2) 表示过去已经开始，持续到现在的动 作或状态。该用法常和表示过去某一 时刻延续到现在的一段时间的状语连 用，如fr 、since等引导的一段时间。 I have been here fr three days. 我在这里已经3天了。 His father has wrked in that factry since 1991. 他爸爸自1991年以来都在这家工厂工作。
1. ---He _______t the party. ---What ______t him? He said he wuld be here by eight ’clck. A. hasn’t cme ;happened           B. didn’t cme; has happened C. isn’t cming; had ccurred      D. hasn’t cme; has happened 解析:  从上下文看，说话人还在等待他的到来因此第一空用现在完成时，第二空是对他迄今情况的推测，也要用现在完成时。
2. I ______ a letter frm him since he left. 　A. didn't receive   B. haven't gt   C. didn't have   D. haven't heard 解析：据since可知，应排除A、C，hear frm sb.=receive/get/have a letter frm sb.意为“收到某人的来信”，故选B。
Has bught Has had Has parked Has nt been Has putHave nt hadHas putHave seenHas turned
Has clsed the drHave gne t bedHas stpped rainingHas had a bathThe picture has fallen dwn