1-现在完成时的概念和用法.ppt

1、Present Perfect Tense,现在完成时,济源市实验中学 李奎,1.现在完成的概念和用法,2.现在完成时的结构,3.现在完成时过去分词的构成,4.现在完成时中延续性动词的使用,现在完成时,5.现在完成时与过去时的区别,6.现在完成时的特殊用法,现在完成时的概念和用法,例句： I have lost my wallet. (含义是:现在我没有钱花了.) Jane has just had lunch. (含义是:简现在不饿了.) Michael has been ill. (含义是:现在仍然很虚弱) He has returned from abroad. (含义是:现在已在此地)

2、 1.现在完成时用来表示过去发生或已完成的动作或状态对现在造成的影响或结果,也就是说,动作或状态发生在过去但它的影响现在还存在.,例句：I havent seen her these days. (这些天我没有见到她。) Mary has been ill for three days. (玛丽已经生病三天了。 ) I have lived here since 1998. (自从1998年我就住在那儿。) 2. 现在完成时可以用来表示发生在过去某一时刻一直持续到现在的动作和状态,常与表示持续的时间状语连用。表示持续动作或状态的动词多是延续性动词。,例句：I havent seen much

3、of him recently. （最近我见他不多。） We have seen that film before. （以前我们曾经看过那部电影。） Have they found the missing child yet ？ （他们已经找到那个失踪的孩子啦？） 3. 现在完成时往往同表示不确定的过去时间状语连用,如already, yet, just, before, recently, still, lately等。,例句：Have you ever been to Beijing？ （你曾去过北京吗？） I have never heard of Bob. (我从未听说过鲍勃。) I

4、have used this pen only three times. （我只用过这只钢笔三次。） 4. 现在完成时常常与表示频度的时间状语连用,如often, sometimes, ever, never, twice, on several occasion等。,例句：Peter has written six books so far. (到目前为止，彼得已经写了六本书。) There has been too much rain in San Francisco this year. （今年三藩市已有太多的雨水。） Up to the present everything has b

5、een successful. (到目前一切都成功了。) 5. 现在完成时还往往可以同包括现在时间在内的时间状语连用,如now, just, today, this morning/week/month/year, up to these days/weeks/months/years, up to present, so far等。,例句：Thomas has studied Russian. (含义：现在不再学俄语) Thomas has studied Russian for three years. (=Thomas began to study Russian three years

6、 ago, and is still studying it now. (同第2点用法第一个例句) 6. 现在完成时表示现在之前已完成的动作,虽然其效果或影响仍然存在但已不再继续,但是有一些现在完成时的句子,在后面加上for+一段时间,则现在完成时的动作就表示延续性.,例句： We have had four tests this term. （这个学期我们已经有了四次考试。） 7. 现在完成时还可以用来表示过去的一个时间到现在这段时间内重复发生的动作.,根据语境，用just,already或yet造句: 1.After lunch you go to see a friend at her

7、house.She saysWould you like something to eat? You say: No, thank you. _( have lunch ) 2.Joe goes out. Five minutes later,the phone rings and the caller says Can I speak to Joe? You say: Im afraid _.( go out ),he has just gone out,Ive just had lunch.,Exercise,3.You are eating in a restaurant this evening. The waiter thinks you have finished and starts to take your plate away.You say: Wait a moment !_ ( not / finish ) 4.You are going to a restaurant this evening. You phone to reserve(预定）a table. Later