人教版八年级英语下册rammar课件2

1、 现在完成时现在完成时 revisionthe present perfect tense 现在完成时谓语动词的构成：现在完成时谓语动词的构成： 1. i _(finish) homework already.2. he _(learn) english for three years. i/ we/you/ they have he/she/it has 助动词助动词have/has +pphave/has +pp（过去分词）（过去分词）句式变换：句式变换：1. he has finished his homework.(变为否定句）变为否定句）2. they have visited ch

2、ina before.(变为一般疑变为一般疑问句，并做肯定回答）问句，并做肯定回答）he hasnt finished his homework.have they visited china before?yes, they have.1.现在完成时的第一种用法是什现在完成时的第一种用法是什么？么？2.常用的时间状语有哪些？常用的时间状语有哪些？3.你能说出你能说出already 和和yet 有哪些有哪些不同吗？不同吗？ 想一想想一想 现在完成时现在完成时(一一)1.表示表示过去发生的动作对现在造成的过去发生的动作对现在造成的影响影响和和结结果果.2.时间状语时间状语: already, y

3、et, ever,never,just,before等等3.already 和和 yet 的区别的区别 already 多用于肯定句；多用于肯定句；yet多用于否定句多用于否定句和疑问句末。和疑问句末。注意：如果肯定句中含有注意：如果肯定句中含有alreadyalready或或justjust ，在，在变成否定句或疑问句时，要把句中的变成否定句或疑问句时，要把句中的already already 或或just just 转换成转换成yetyet. . i havent seen the film yet.2.i have already finished my homework.have yo

4、u finished your homework yet?3. mother has just cleaned the house.mother hasnt cleaned the house yet.1. i have already seen the film. 1.i _ (do) my homework already.2.he _(not finish) his homework yet.3.we _ never _ (see) this book before.4.mother _ just _(clean) the house.5.sally _(visit) china bef

5、ore.have donehas not finishedhaveseenhascleanedhas visited用动词的适当形式填空：用动词的适当形式填空： 现在完成时现在完成时(二二)1.现在完成时的第二种用法是什现在完成时的第二种用法是什么？么？2.常用的时间状语有哪些？常用的时间状语有哪些？3.你能说出你能说出for 和和since有什么不有什么不 同吗？同吗？ 现在完成时现在完成时(二二) 1.表示表示过去发生的动作过去发生的动作,一直延续到现在一直延续到现在, 并且有可能继续延续下去并且有可能继续延续下去. 2.时间状语时间状语: 通常和通常和for, since 引导的时间状语

6、连用引导的时间状语连用. 1.for + 一段时间一段时间 for a week, for 3 years, for a long time, 2. since +时间起点 since+一段时间+ago since+从句(一般过去时) since 2 oclock, since yesterday, since3 years ago, since i came here等等 .注意注意: 对对for或或since引导的时间引导的时间状语提问状语提问 必须用必须用_ 1. i have lived here for 10 years. how long have you lived here?2

7、. she has been here since 2 hours ago. how long has she been here? how long 选用选用forfor和和sincesince填空填空: :1.we havent seen each other _ a long time.1.we havent seen each other _ a long time.2.his father has been in the party _ 10 years 2.his father has been in the party _ 10 years ago.ago.3.the film

8、has been on _ 20 minutes.3.the film has been on _ 20 minutes.4.mr green has worked here _ he came to 4.mr green has worked here _ he came to china.china.5.his grandpa has been dead _ several years.5.his grandpa has been dead _ several years.forforsincesinceforforsincesinceforfor注意：在现在完成时的肯定句中，注意：在现在

9、完成时的肯定句中， 动词动词不能和不能和for, since 引导的时间状语连用。要连用必引导的时间状语连用。要连用必须改成延续性动词须改成延续性动词最常见的有：最常见的有：buy-have, borrow-keep, leave-be away (from) die-be dead,come-be here/be in join-be in /a member of begin/start-be on非延续性非延续性 举例：举例：1.1.我买了这本书五年了。我买了这本书五年了。2.2.这位老人已经死了十年了。这位老人已经死了十年了。 i i have boughthave bought th

10、is book for five years. this book for five years. i i have hadhave had this book this book forfor five years. five years. the old man the old man has diedhas died for ten years. for ten years. the old man the old man has been deadhas been dead forfor ten years. ten years.( f )( f )( t )( t )have bee

11、n to 曾经去过某地（已返回）曾经去过某地（已返回）have gone to 去了某地去了某地 （还没有回来）（还没有回来）a b a b巧记：巧记：been to ，gone to 意不同，两者用法要记清；意不同，两者用法要记清； have been to + 地名，曾经到过某地方；地名，曾经到过某地方； have gone to + 地点，到某地去了或已走远。地点，到某地去了或已走远。1.i have gone to japan before. ( )2.guilin is very beautiful, i have been to there twice. ( )3.his fath

12、er has gone to beijing .he will be back next week( )4.where have you gone?( )true or false?ffftbeenbeen你能说出一般过去时和现在完成你能说出一般过去时和现在完成时的区别吗？时的区别吗？一般过去时与现在完成时有一些明显的时间状语。一般过去时与现在完成时有一些明显的时间状语。 1.yesterday, last year, in+过去某一年，过去某一年，two days ago, just now等常用于一般过去时等常用于一般过去时 2. already, yet, ever, never, ju

13、st, before, so far, in the past/ last few years(在过去在过去/最近的几年里最近的几年里)，for+一段时间，一段时间，since+时时间起点间起点等常用现在完成时等常用现在完成时 当堂检测当堂检测一、句式变换：（一、句式变换：（5分分,每空每空1分）分）1. jack has visited china before.(改为否定句）改为否定句） jack visited china before.2. they have come into the classroom.(改为一般疑问句改为一般疑问句） come into the classroom?3. he has been here for 12 years.(划线提问）划线提问） has he been here?hasnthave theyhow long 二、用所给词的正确形式填空二、用所给词的正确形式填空: : （3 3分，每空分，每空1 1分）分） 1. i （live）here for ten years . 2. i （live）here in 1998. 3. he (not return) the book yet.三、判断正误：三、判断正误：(2分，每题分，每题1分分) 1.1.他爷爷已经去世