1、现在完成时20060218、 句子结构： have(has) + ppt否定： have(has) + not + ppt疑问： Have + 主语 +(not) + ppt + ?缩写：Ive = I have youve = you have Hes = he has Shes = she hasHavent = have not hasnt = has not 、 用法1 表示动作开始于过去，现在仍在延续He has studied English for five years. （现在仍在学习）He studied English for five years. （现在未在学习）I h
2、ave lived here since I was born. （现在还住这）I lived here for two years. （曾住过两年，但现在未住）I live here. （现在住，但不知过去是否住）2 表示动作发生于过去，现在不再延续，但动作的结果影响着现在的状态I have been to Beijing. （已形成自己对北京的印象） I have never been to Beijing. Have you had breakfast?I have heard that. （已知道情况）I have seen (that). （已知道情况）I have got two
3、pounds. Have you got tissue?3 表示刚刚发生的动作或状态此情况下，多半有时间副词(just, already, yet, still, recently, at last, finally, so far)连用。He has left for Shanghai. She has just received 1 million from her fathers will.I have just arrived by train. I have (already) finished my homework (already). I have not finished m
4、y homework(,) yet. Have you finished your homework(,) yet?Ive collected 15 stamps so far.Shes never eaten a mango before. Have you ever eaten a mango?Its the most interesting book Ive ever read.Toms never appeared on TV before now.4 与频度副词连用表示经验频度副词有：once, twice, several times, again and again, ever,
5、 never. 注意：完成时中的频度副词不能是：one a month, twice a week, 之类。I have been Beijing several times. I have never been to Beijing. I dont think we have ever met before. 比较：I go to Shanghai twice a month.5 动词“去”和“来”在完成时中的不同表达He has gone to Shanghai. 表示已完成的动作（现在不在本地）He has been to Shanghai. 表示有过体验或经验（现在可能在本地）She
6、has come here to see you. 表示她已经到来，现在在面前。She has been here to see you. 表示她曾来过，现在不在面前。三、现在完成时的时间状语特点：表示时间段。因此，时间的连接词有：for, since, before.1 时间状语的构成：时间连词 + 具体时间 或 表示时间的句字。My sister has stopped crying before my mother came. （妈妈来前已停止）Tom has come before I finished my homework.2 时间连词的用法（1） for: 只能接表示时间段的具体
7、时间 He has watch TV for three hours.（2） Since: 可接表示日期、月份和年份的具体时间；也可接句子。（3） Before: 可接表示钟点、日期、月份和年份的具体时间；也可接句子。四、用法特殊的时间副词 already, yet1. already 用在肯定句， yet 用在疑问和否定句；2. already 既可放在句中，也可放在句末； yet 只能放在句末。I have (already) finished my homework (already). I have not finished my homework(,) yet. Have you finished your homework(,) yet?3现在完成时中不能出现的时间副词：ago, when
