八年级英语下册unit1grammar课件.ppt

1、教学目标:1巩固现在完成时的构成方法:由助动词have/has+pp(过去分词）2否定句的结构：have/has+not+pp 一般问句have/has 放在句首3特殊问句:where,how many+名词(复数),how many times,what,how long引导的句子4.能正确运用现在完成时态现在完成时现在完成时 1 表示之前已发生或完成的动作或状态，但它的影响现在还存在；表示之前已发生或完成的动作或状态，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。也可表示持续到现在的动作或状态。2其构成：其构成：have(has)+过去分词过去分词。3规则变化的过去分词与过去式的变

2、化一样，在动词词尾加规则变化的过去分词与过去式的变化一样，在动词词尾加ed;不规则变化的过去分词见不规则动词表不规则变化的过去分词见不规则动词表，需要同学记忆。，需要同学记忆。现以现以see the film为例将现在完成时的肯定句，为例将现在完成时的肯定句，否定句和疑问句列否定句和疑问句列表如下：表如下：肯定句：肯定句：I/You/We/They have seen the film.He/She/It has seen the film.否定句：否定句：I/You/We/They have not/havent seen the film.He/She/It has not/hasnt s

3、een the film.疑问句：疑问句：Have I/you/they seen the film?Yes,you/we/I/they have.No,you/we/I/they havent.Has he/she/it seen the film?Yes,he/she/it has.No,he/she/it hasnt.Makeupsentences1dooneshomeworkdone2studyinNanzhastudied3readEnglishread4havelunchhad5buyaCDbought6mopupthefloormopped7visitthenaturereser

4、vevisitedHave/has+done现在完成时的时间副词和时间短语现在完成时的时间副词和时间短语:1.副词副词already和和yet。already一般用于肯定一般用于肯定句中，句中，yet一般用于否定句和一般用于否定句和疑问句中。疑问句中。如如:Wehavealreadyfinishedourhomework/already.我们已完成作业了。我们已完成作业了。Theyhaventfinishedtheirhomeworkyet.他们还没有完成作业。他们还没有完成作业。-IhaveneverbeentotheGreatWall.我从未去过长城。我从未去过长城。2.副词副词ever和

5、和never。多用于否定或疑问。多用于否定或疑问句中，表示句中，表示“曾经曾经”或或“从未从未“等。等。如如:-HaveyoueverbeentotheGreatWall?你曾经去过长城吗你曾经去过长城吗?Hehasbeentheretwicerecently.近年来他去过那里两次了。近年来他去过那里两次了。3.用表示到说话为止的过去时间状语用表示到说话为止的过去时间状语,如如:just,before,recently等。等。如如:Ihaveseenherbefore,butIcannotrememberwhere.我以前见过她，但记不起在哪里见过。我以前见过她，但记不起在哪里见过。注意：当在

6、肯定陈述句中含有注意：当在肯定陈述句中含有alreadyalready或或just just 时，在转换成否定句或疑问句时，要把句中的时，在转换成否定句或疑问句时，要把句中的already already 或或just just 去掉，在句末加上去掉，在句末加上yet.yet.I havent seen the film yet.I have done my homework already.I havent done my homework yet.Mother has just cleaned the house.Mother hasnt cleaned the house yet.I h

7、ave seen the film already.常与现在完成时连用的副词：1.already,just,yet连用 yet用在否定句和一般问句中 already用在肯定句中2.ever,never,before连用 I have ever taught in No.1 Middle School.I have_taught in No.1 Middle School.nevernever注:改否定句时ever必须改为never用所给动词的正确形式填空:1.I_(mop)the floor already.2.I_(not wash)the clothes yet.3.Tom isnt he

8、re.He _(go）to the bank.4.The girl _(not give)it to me yet.5.Tom and Jill _ just _(buy)some flowers.6.They_ever_(study)in the school.7.We_never_(see)such an interesting film.8.My mother_ never _(be)to Shanghai before.9.Mike_(have)lunch already.10.Jill_(meet)me yesterday afternoon.11.The first class _

9、already(begin）.have moppedhavehavent washedHasshas gonehas givenhaveboughthavestudiedstudiedhaveseenhasbeenhas had methas begun1 I have already worked out this math problem?(改为否定句)I worked out the math problem _ .2 He has already finished the book.(改一般疑问句并做回答)_he the book _?Yes,he .No,he .4 I have g

10、ot a book.(改一般疑问句并做肯定和否定回答)you a book?Yes,I .No,I .5 He has got a book.(改一般疑问句并做肯定和否定回答)he a book?yes,he .No,he_.6.Millie has ever traveled to Beijing twice._Millie _ _ to Beijing?Yes,_ No._ Millie _ _traveled to Beijing.()_ _ _ _Millie _ to Beijing?6 You have done your homework,you?(改为反意疑问句)7 He ha

11、s never been abroad,he?(改为反意疑问句)8 We have got little milk,we?(改为反意疑问句)haventyetHasfinishedyethashasntHavegothavehaventHasever travelledhasneverHowmanytimeshaseverbeen句型转换：1.Ive written a letter already.（否定句.一般问句）2.My daughter has flown her kite（2-8划线部分提问）_has _daughter_?3.They have ever visited Zhal

12、ong Naturre Reserve.they ever visited?4.The Green family have taken over100 photos this year._ _ _have The Green family _ this year?5.Miss Liu has been to Hangzhou twice._ _ _ _Miss liu _ to Hangzhou?6.David goes to the park twice a week._ _ _ David _ to the park?7.The police have stayed there for a

13、n hour._ _ _ the police _ there?改错：1.I have meet Mr Green yet.2.Tom have just telled a story.3.We have heared the talk already.4.Have your father bought a new car?5.He has just drink some milk.6.Have you lunch yet?7.Jill has went to Dalian three times.8They have planted 20 trees just now.9.When have

14、 you see the film?Just now.10.They havent been to Guangdong already.11.The police has return already.翻译：1.我已经看过这场电影。(see)2我爸刚刚买了台电脑。(buy)3警察已经抓住了那个小偷。(catch）4他们已经去无锡了。(go)5我们刚刚喝了可乐。(drink)6那个小孩已吃了一碗米饭。(eat)他是半小时前吃的。7我奶奶从没拍过照。(take)8昨天他们去天安门广场了。(go)动词填空：(先找出关键的时间或副词）1.So far,no man _(travel)farther t

15、han the moon.2.I_(hear)from my parents recently.3.Tom with his friends _(be)to Jiangyin many times.4.Hu Jingtao _(visit)several countries this year.5._your mother _(write)to you yet?Yes,she_.6.Look,the snow _(stop).Lets _(make)a snowman.7.My family _(travel)a few cities in recent years.8.Our city _(

16、change)a lot during the past few years.9.The twins _(see)the film twice.10.What_you just _(do)with the boy?11.We_(hold)five class meetings already.综合练习:(找出关键词或时间）1._you_(go)to Yunnan?Yes,I_.I _(go)there last year.2.Tom_（not see)the doctor yet.He _(see)him tomorrow.3.Mum_(drink)some milk already.She _(drink)it 10 minutes ago.4.Nick_(eat)KFC once a week.Nick _(read)the book once.5.The police_（watch)the traffic this time yesterday.6.There_(be)great changes in our city during the past 7 years.7.Xiao