现在完成时讲解与练习一、构成现在完成时是由助动词h a v e(h a s)+动词的过去分词构成。
助动词说明该谓语是属于现在时范围，它和主语的人称、数要保持一致。
过去分词是主要的谓语动词，说明句子的意义。
二、用法（1）表示动作发生在过去某个不确定的时间，但对现在留下了某种影响和结果。
常被j u s t、a l r e a d y、y e t等副词修饰。
如：-H a v e y o u h a d l u n c h y e t?-Y e s,I h a v e.I'v e j u s t h a d i t.你（已经）吃午饭了吗？我刚刚吃过。
（现在我不饿了）（2）表示从过去某一时刻开始一直持续到现在的动作或状态。
这个动作可能刚停止，可能仍然在进行。
常带有f o r和s i n c e等表示一段时间的状语。
如：H e h a s t a u g h t h e r e s i n c e1981他自1981年就在这儿教书。
（可能还要继续教）I h a v e n't s e e n h e r f o r f o u r y e a r s.我有四年没见到她了。
（3）表示说话前发生过一次或多次的动作，现在成为一种经验，（即表示过去的经历）一般译为汉语“过”，常带有t w i c e,e v e r,n e v e r,t h r e e t i m e s等时间状语。
如：I h a v e b e e n t o B e i j i n g t w i c e.我去过北京二次。
三、结构1）．陈述句结构：主语＋h a v e(h a s)（n o t）+过去分词＋其它。
h a v e n o t=h a v e n’t h a s n o t=h a s n’t.2）．一般疑问句结构：H a v e(H a s)＋主语＋过去分词＋其它？3）．特殊疑问句：特殊疑问词＋h a v e(h a s)+主语+过去分词＋其它？e g.H e h a s a l r e a d yf i n i s h e d h i s h o m e w o r k.H e h a s n’t f i n i s h e d h i s h o m e w o r k y e t.H a s h e f i n i s h e d h i s h o m e w o r k y e t?--Y e s,h e h a s./N o,h e h a s n’t./N o,n o t y e t.四、现在完成时的时间状语（1）现在完成时属于现在时范围，故不能和过去的时间状语连用。
2.肯定句：主+ have/has + done(动词的过去分词) +其他E.g.: I have painted six new pictures this week.Li Ming has written three emails today.（注：has 用于第三人称单数，have 用于其他所有人称）常见动词的过去分词：3.否定句：主+hav e/has + not + done(动词的过去分词) +其他注：have not=haven’t has not= hasn’tE.g. I haven’t read the book yet.My aunt hasn’t lived in China for 3 years.4.一般疑问句：表示过去发生的某一动作I have seen this film.（强调对现在的影响，电影的内容已经知道了。
）She has returned from Paris.（她已从巴黎回来了。
）She returned yesterday.（她是昨天回来的。
）He has been in the Party for three years.(在团内的状态可延续)He joined the Party three years ago.( 三年前入党，joined为短暂行为。
)★When常与与一般过去时连用，How long常与与现在完成时连用----When did you come to Beijing? ----Two days ago/ Last week.----How long have you been in Beijing? ----For two days/ since two days ago.一、选择题。
( )1.It’s nice to see you again. We each other since 2014.A. won’t seeB. don’t seeC. haven’t seenD. didn’t see( )2. My mother a good example for me since I was young.A. wasB. has beenC. will beD. is( )3.—When will A bite of China begin tonight?—It for ten minutes.A. will beginB. has begunC. will be onD. has been on( )4.By the end of last week, she in the west of China for two months helping the homeless children.A.will stayB. has stayedC. would stayD. hadstayed5.—A new shop for a week nearby. Let’s have a look there.—Good idea. But it doesn’t on Mondays.A.opened; openedB. has been opened; openB.has opened; opened D. has been open; openCBDDD二、填空题1.—you (clean) the classroom?—Yes, we (do) that already.2.How many times you (be) there?3.I (read) the novel twice. It’s interesting.4.Mr. Chen (give) up smoking last year.5.Mr. Chen (give) up smoking since last year.1.Have; cleaned; have done2. have; been3. have read4. gave5. has given三、用have/has been (to)和have/has gone (to)填空1. Mum is not at home now. She has gone to to the shop.2. —Have you ever been to Sanya? —Never.3. —Where is Jim? —He has gone to Wuhan.四、用since或for填空1. for two years2. since two years ago3. since last month4. since 19995. since yesterday6. since 4 o’clock7. for 4 hours 8. since an hour ago9. I’ve known him since we are children.10. Our teacher has studied Japanese for three years.五、英汉互译及句型转换。
