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1、. . . . . 现在完成时（I） 第八单元语法知识定义：（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须存在.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 a
2、lready lost the 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+havent/ hasnt+过去分词+其他+时间.eg: I havent lost the key yet. He hasnt ever read that book . They havent just cleaned their hands.3.一般疑问句：Have/Has+主语+过去分词+其他
3、+时间？ 肯定回答：Yes, 主语+have/ has. 否定回答：No, 主语+havent/hasnt. 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/has+主语+过去分词+其他+时间？eg: What have you alread
4、y done? （done是do/does的过去分词）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. for+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 English for 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 Beijing since he was b
5、orn . （自从他出生以后就居住在北京）解释：从出生后就一直住在北京，持续到现在，还有可能一直住下去）Have you stayed here since 3 oclock? （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 havent 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
6、China.5. His grandparents have been dead _ several years. 6. Its five years _ we met last time.7.I have already had dinner. （否定） I _ _ dinner _.8. 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） _ _ _
7、 _ _?11. He has just finished his homework. _ _ _ _ _?12. Susan has learned English 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，如yesterday,last night, three weeks ago, in1990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过去的时间状语连用.eg: I ha
8、ve 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间状语last week） 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 1993. （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 _
9、(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 novel twice. Its interesting. 6. Mr. Chen _(give)up smoking last year.7. She _(go) to Pairs, hasnt she? Yes. How _ she _(go) there? She _(go) there by air. 现在完成时（II） 第九单元语法知识1. 构成：含有be动词
10、的现在完成时的谓语部分由 “have/has+ been+ to+地点”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 Australia. They have been to Beijing. He has been to South Africa.(2)否定句： 主语+havent/hasnt+ been+ to+地点. eg: I havent been to Australia. They havent been to Beijing. He has
11、nt been to South Africa.(3)一般疑问句：Have/Has+主语+been + to+ 地点？肯定回答：Yes, 主语+ have/has. 否定回答：主语+havent/ hasnt. eg: Have you been to Australia? Yes, I have. No. I havent. Have they been to Beijing? Yes, they have. No, they havent. Has he been to South Africa? Yes, he has. No, he hasnt.（4）特殊疑问句：特殊疑问词+have/
12、has+ 主语+ been? eg: 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.可以和never, ever, once, twice, three/fourtimes 等副词连用.eg: They have been to Chongqing twice. I have never been to Sichuan. Has she ever been to Hainan?3. 区别：(1). hav
13、e/ has been to+地点 表示：曾经去过某地，已经回来了(2). have/ has gone to+地点 表示： 去了某地，还没有回来eg: She has been to Shanghai. （她去过上海，已经回来了） She has gone to Shanghai. （她去了上海，还没有回来）(3). 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我到上海已有三年了。He has been in London for half a month他来伦敦已有半个月了。(4). 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 minutes. 电影已经开始了10分钟了。例题：1.Where is your brother?He _ the shop. Hell be back
