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1、I clean the blackboard every day. Ill clean the blackboard in several minutes. Im now cleaning the blackboard. I cleaned the blackboard several minutes ago. I have cleaned the blackboard for several minutes.,I have been cleaning the blackboard for several minutes / since several minutes ago.,现在完成时和现
2、在完成进行时的区别 I,(1)表示从过去某一时间开始一直在进行的动作, 并有可能持续下去, 强调动作的全过程； 表示从过去到现在的重复性动作。 (2)注意:多用于延续性动词，如work, live, study, skate, collect,表示在某一特定时间之前曾经发生过的动作,或者到这一时间为止已经完成的动作.,1.现在完成时: have + 过去分词,2.现在完成进行时:have + been +现在分词,现在完成时和现在完成进行时的区别 II,（1）在不用时间状语的情况下，现在完成进行时表示动作仍在进行。而现在完成时则表示动作在过去已结束。如： The students have b
3、een preparing for the exam. （还在进行）学生们一直在准备考试。 The students have prepared for the exam. （已经结束）学生们为考试作了准备。,（2）在强调指出动作还未结束，还要继续下去。如： Ive been reading this book for two hours, but I havent finished it. 这本书我已读了两个小时了，但我还没读完。 Ive read this book. 我已读完这本书了。,现在完成时和现在完成进行时的区别 II,（3）有些表示状态、感情、感觉的静态动词，如：have, li
4、ke, hate, hear, know, sound等动词不能用于现在完成进行时，但可用于现在完成时。如： Theyve known each other since 1970. 自从1970年起他们就相互认识了。,（4）现在完成进行时也可表示现在以前这段时间反复发生的事情。如： Weve been seeing each other quite a lot recently. 最近我们经常见面。,现在完成时和现在完成进行时的联系,1简略回答都一样Yes, I/we/they have. No, I/we/they havent.Yes, he/she/it has. No, he/she/
5、it hasnt.,2时间状语：都可以用for或sinceThey have skated _ .They have been skating _.,A three hours agoB for three hours agoC since three hours agoD for three hours E since three hours,Exercise I（单项选择）,Even though they _ for twenty years, the two neighbors do not get on well with each other. A. have been lived
6、 side by side B. had been living side by side C. have been side by side living D. have been living side by side 2. I havent seen Mary these past few days, Im afraid she _ herself for some time. A. hasnt been feeling B. hadnt been feeling C. isnt feeling D. wasnt feeling 3. She _ on this essay for tw
7、enty minutes but she has written only about a hundred words. A. will be working B. worked C. has been working D. will have worked,4. -Hi, Tracy, you look tired. -Im tired. I _ the living room all day. A. painted B. had painted C. have been painting D. have painted 5. -Hi, Joan, I have seen you for w
8、eeks. What _ recently? -Carrying on some research on wildlife. A. have you been doing B . have you done C. were you doing D. did you do 6. You must be tired now since you _ for five hours. A. have been worked B. have been working C. worked D. would work,16 Different Tenses (动词的16种时态),一般时的用法,I. 一般现在时
9、：1. 用法和意义（1）表示现在经常性或习惯性的动作或状态，如: I write to my penfriend in England once a month. （2）表示普遍真理或客观事实，如: Oil is lighter than water. Time waits for no man.（3）报刊杂志、故事情节介绍和舞台说明等也用一般现在时。,2. 常见的时间状语： always, often, sometimes, usually, every day, twice a week, now and then等。 但有时时间状语不表示出来。,一般时的用法,II. 一般过去时： 表示过
10、去发生的动作或存在的状态，通常与表示过去的时间状语连用。yesterday, the day before yesterday, last night/week/month/year/summerin 1999, a moment ago, this time, this morning, in those days, just now.,如：We went to see his uncle last year.,一般时的用法,III. 一般将来时：（1）表示在将来某一时间将要发生的动作或状态。常与表示将来的时间状语连用， tomorrow, the day after tomorrow, t
11、his evening, tonight, next week/month/year, in ten minutes, some day, in 2001, in the future, at the end of next semester.如：There will be a meeting next month.,（2）常用”be going to+动词原形”的结构表示主语的主观想法或打算，如： Were going to have a trip in Hawaii.,进行时的用法,(1)表示某一时刻或某一阶段时间正在进行着的动作。强调动作进行的过程，而非状态。一般来说， 静态动词如hav
12、e, own, seem等，或表示知觉、情感的动词如see, hear, taste, know, believe, understand, think, like, love, hate, want等没有进行时态。 有时用进行时态，也是具有别的含义。如： I think you are right. 我认为你是对的。 Shes thinking about the problem. 她正在思考那个问题。,(2) 常见的时间状语： at this time, at this moment,Exercise II,Hurry up, or we _ (miss) the plane.Do you
13、 know the earth _ (go) round the sun?Lily, go and get the telephone. It _ (ring).He _ (not make) sure if he _ (visit) the factory if he _ (come) back early.She said that she _ (return) to the area the next month.,Exercise II,What _ you _ (do) between 8 and 10 yesterday morning?After he turned on the
14、 light he _ (begin) to read books.When I entered the room, he _ (lie) in bed.The story _ (happen) long ago.They _ (watch) the NBA match at this time yesterday.,Half的用法,1. 一个半小时,an hour and a half = one and a half hours,2. 半数的学生为女孩.,Half the students are girls.,4. 4的一半是2.,Half of four is two.,3. 他们中的一半为男孩.,Half of them are boys.,(of),Half of + 名词, of 有时可省略.Half of + 代词, of 则不可省略!,
