2017人教版八年级下英语现在完成时语法讲解

1、现在完成时（I）语法知识定义：（1）表示过去发生或已经发生的动作对现在造成的影响或结果，这个影响和结果对 现在还必7存在.常与already （已经），yet （已经，还），just （刚刚），ever （曾经），never等词 连用.already常用于肯定句或疑问句（均表示：已经） yet :常用于否定句（表示：还、尚），疑问句末尾（表示：已经）.现在完成时的构成及句型结 构：（注：过去分词的变化分规则变化与不规则变化，规则变化与动词原形变过去式一样，不规则变化见教材137页）1 .肯定句：主语+have/has+过去分词+其他+时间.eg:I have already lost the

2、key.我已经弄丢了钥匙.（我现在没有钥匙）He has ever read that book ?他曾经看过这本书.（了解书的内容）They have just cleaned their hands.他们刚刚洗过手了.（手是干净的）2 .否定句：主语+haven hasnt+过去分词+其他+时间.eg: I haven lost the key yet.He hasntever read that book .They haventjust cleaned their hands.3 .一般疑问句：Have/Has+主语+过去分词+其他+时间？肯定回答： Yes,主语+have/ has.

3、 否定回答：No,主语+haven t/hasn t. eg: Have you already lost the key? Yes, I have. No, I havent.Has he ever read the book? Yes, he has. No, he hasnt. Have they just cleaned their hands? Yes, they have. No, they havent.4 .特殊疑问句：特殊疑问词+ have/hasn主语+过去分词+其他+时间？eg: What have you already done? （done 是 do/does 的过

4、去分词）What has he ever done?What have they just done?定义：（2）现在完成时表示从过去开始一直持续到现在还有可能继续持续下去的动作或状态常与 for, since引导的时间短语或从句连用fo叶表示一段时间的词组；| since+过去某一时间点的词组或一般过去式的句子.eg: She has learned Englishor 5 years.（她已经学习五年英语了）解释：一直在学，持续了五年，并且还可能持续学下去He has lived in Beijingsince he was born ?（自从他出生以后就居住在北京 ）解释：从出生后就一直

5、住在北京，持续到现在，还有可能一直住下去）Have you stayed heresince 3 o clock?（自从3点后你就一直呆在这儿吗？）例题：选用for和since填空：1. We haven t seen each other a long time. 2. His father has been in the factory 10 years ago.3. The film has been on 20 minutes.4. Mr. Green has worked here he came to China.5 . His grandparents have been dea

6、d several years. 6. It s five years we met last time7have already had dinner. （否定）I dinner6 Mum has cooked the dinner.Mum the dinner.9. Susan has learned English at school. Susan English at school.10. I have already had dinner. （提问）?11. He has iust finished his homework. ?12. Susa n has lear ned En

7、glish at school. ?13. Mum has cooked the dinner. ?（3）现在完成时与一般过去时的区别：现在完成时 属于现在时态的范围.不能和表示过去的时间状语连用.女口 yesterday,last night, three weeks ago, in199 等.一般过去时只表示过去的动作或状态，和现在不发生关系。一般过去时就可以和与表示一过去的时间状语连用.eg: I have already seen the film.（现在完成时，已经看了这部电影，并且知道电影的内容）I saw the film last week.（一般过去式，因为后面有表示过去的时

8、间状语last weel ）He has lived here since 1993.（现在完成时，后面有 since引导的时间状语从句）He lived here in 佃93.（一般过去时，1993年住在这儿，现在没住在这儿了）例题：1. _ you（clean） the room? Yes, we （do） that already.2. When you （do） it? We （do） it an hour ago.3. he (see) this film yet? Yes. 4. When he (see) it? He it last week.5. I (read) the

9、novel twice. It s in6e Ms.tKnigen (give)up smoking last year.7. She(go) to Pirs, hasn t shYAs. How she (go) there? She (go) there by air.3“ have/has+ been+ to+ 地点”现在完成时（II ）语法知识1 .构成：含有be动词的现在完成时的谓语部分由构成，表示：曾经去过某地（been是be的过去分词，不规则变化）2 .基本句型:(1)肯定句：主语 +have/has+ been + to+ 地点.eg : I have been to Aust

10、ralia.They have been to Beijing.He has been to South Africa.(2)否定句： 主语 +havent/hasn t+ been + to+ 地点.eg: I haven been to Australia.They haven been to Beijing.He hasntbeen to South Africa.Have/Has+ 主语 + been + to+ 地点？(3)一般疑问句：肯定回答：Yes,主语+ have/has.eg: Have you been toAustralia?Have they been to Beiji

11、ng?Has he been to South Africa?(4)特殊疑问句：特殊疑问词 +have/has+否定回答：主语 +haven t hasnt.Yes, I have. No. I haven t. Yes, they have. No, they haven .t Yes, he has. No, he hasnt.主语+ bee n ?7eg :Where have you been?Where have they been?Where has he been?3 .用法：用来表示之前已经发生和完成度的动作与状态，其结果却和现在有联系动作和结果发生在过去，但它的影响现在还在.

12、可以和never, ever, once, twice, three/four?times等旨U词连用.eg: They have been to Chongqing twice I have neverbeen to Sichuan.Has she ever been to Hainan?3 have known her since the n.（修出ave用asbeen *o厂直嬲心，表第ow用聚袋蛙京地，已经回来了r（2） 延续性动词：也成终止性动词或瞬商结词，表示不能延续的碍乍，这种动作莒生后（3） . have/ has gone to+ 地点 表示： 去了某地）还没后回来： eg:

13、 She has been to Shanghai.（她去过上海）已经回来了） She has gone toShanghai.（她去了上海，还没有回来）（4） . have been in 表示“在某地呆了多少时间”，常与时间段状语连用eg: I have been in Shanghai for three years .我至 U 上海已有三年了。He has been in London for half a month.他来伦敦已有半个月 了。（5） . have been on 表示“已经开始了多久表示持续性”eg: The film has been on for ten minu

14、tes.电影已经开始了 10 分钟了。例题：1? Where is your brother? He the shop. He II be back soon.2. 一 you ever to America Yes, I New York twice.3. 一 David Australia. Im sure has already arrived.4. Is Benny here? No, he the school library. He left five minutes ago.5. Mike and his parents the south for half a year.6.

15、Mum is not at home now. she the shop.7. You can t find him. H Xi an.8. Mr. Zhang this school for ten years. He knows everyone here.9. Miss. Brown China three times.10. I the West lake, Look, I have taken many photos of it .11. Tom Jim s home, but he hasn t come back.12. We the bookshop and bought ma

16、ny books.13. My parents Shandong for ten years.现在完成时（III ）语法知识动词按其动作发生的方式，发生过程的长短可分为延续性动词与非延续性动词。1.延续性动词：表示能够延续的动作，也可以表示经验与经历.eg: learn, work, stand, lie, walk, sleep, keep, wait, watch, sing, read, stay, live延续性动词可以与耿和 sinceJ引导的时间状语连用：eg: He has lived here for 6 years.（ 他在这儿住了六年了，一直住在这儿， live 是延续性动

17、词，并且很有可能继续居住下去）11I have known her since the n.（自从那时起我就认识她了，一直都认识，know是延续性动词）2.非延续性动词：也成终止性动词或瞬间动词，表示不能延续的动作，这种动作发生后立即结束.eg: open, close, begin, finish, come, go, move, borrow, lend, buy, die非延续性动t不能与 for和since引导的时间状语连用，常用的时间状语有two yearsago, at 5 6clock, yesterday, the day before yesterday, this morn

18、in等表示过去的时间 ？eg: His grandmother died 10 years ago.She finished the work at 6 oclock.2.非延续性动词与延续性动词之间的转换（常用）put on f wearcatch a cold f have a cold（1）.转化为相应的延续性动词，用于现在完成时态eg: borrow keepbuy haveget to know f know get to sleep f sleep.（2）.转化为.“be+形容词/副词./介词/名词”eg: begin/start f be on open f be open le

19、ave fgo out f be outget to/ arrive in (at)die f be dead f be in+地点be away (from) get up f be up/reach finish f be overfall ill f be 川fall asleep f be asleepjoin f be in+活动/组织go to school f be in school become f bemake friends f be friendsclose f be closedgo to bed f be in bed come/ go fbe +相应的介词短语例：

20、下面是句子的同义句转换将原句一般过去时改成现在完成时（现在完成时，将 die变为beeg: 1. The old man died four years ago.(般过去时)（现在完成时，since跟过去The old man has been dead for four years.dead ) The old man has been dead since four years ago5.的时间点)2. I borrowed the book five days ago.I have kept the book for five days. theI have kept the book sincelivedays ago. He has had the3. He bought the bike three years ago.He has had bike for three years.My sister became生秋cgone yearsagoo .My sister has been a nurse for one year.been a nurse since one4. She went to school two days ago.year.She has been in schoolfor tw