as引导定语从句PPT教学课件

1、 在限制性定语从句中，如果先行词被the same, such, as, so 等词修饰时，定语从句应由as引导。as作宾语不可省略。 1)He is such a teacher as we respect. 2) I like the same book as you do. It is so big a stone as no man can lift. 第1页/共19页 在定语从句中，一般的从句关系代词是whichwhich、whowho、whomwhom、thatthat、 whosewhose, , 其代替主句中的人或物，在从句中做主语、宾语或定语。一、asas引导限制性定语从句主

2、要结构有：the sameasthe sameasasasasassuchassuchassoassoas第2页/共19页1.Itsthesamepersonaswewantedtofindyesterday.我们昨天要找的是同一个人。2.SuchgirlsasheknowsaregoodatEnglish.他所认识的女孩都擅长英语。3.Doyouhavesuchbooksaswelike?你有我们喜欢那种书吗？4.Shewillmarryashealthyamanasshecanfind.她将嫁给她能找到的任何一个有钱人。第3页/共19页5.Thereissowarmahouseaswewa

3、nttolivein.这里有如此暖和的房子，我们都想住在里面。6.Hehassodifficultaproblem,asnoneofuscansolve.他有如此难的一个问题，我们没有人能解决。第4页/共19页二、引导非限制性定语从句as引导非限制性定语从句，指代整个主句内容，从句可置于句首，句中或句尾1Aseveryoneknows,Chinaisabeautifulcountrywithalonghistory.每个人都知道，中国是一个有着悠久历史的美丽国家。2Theearth,asweknow,movesroundthesun.地球，我们都知道，围着太阳转。3Tomworkshardan

4、diswillingtohelpothers,asweallknow.汤母工作努力，并且乐于助人，这一点我们都知道。第5页/共19页正像经常发生的那样第6页/共19页as 和 which 都可以指代主句中的一部分或整个句子的内容，有时可以互换，但 as 引导的非限制性定语从句位置比较灵活，可以位于主句前面，中间或后面，一般用逗号与主句隔开，而 which 所引导的非限制性定语从句只能放在主句之后。 As 和 Which 引导的非限制性定语从句的区别 第7页/共19页1.Asyouknow,TaiwanisaninseparatepartofChina.2.Taiwan,asyouknow,is

5、aninseparatepartofChina.3.TaiwanisaninseparatepartofChina,asyouknow.4.TaiwanisaninseparatepartofChina,whichyouknow.位置不同As与 which的区别第8页/共19页1.Theyremarried,asweexpected.2.Theyremarried,whichwehadntexpected3.Asoftenhappens,theywonthematchagain.4.Itrainedheavily,whichpreventedusgoingout. 意义不同 （as “正如，就

6、像” 表示符合人们的认识和事物的习惯性等意义，即从句与主句语义一致。当从句与主句语义不一致时或从句与主句之间是因果关系时用which）第9页/共19页asanybodycansee,asweallknow,aswehadexpected,asiswellknown,ashasbeensaidbefore,asoftenhappens,asitis,asisnatural,asisthecase1.Asisknowntoeverybody,themoontravelsroundtheearth.2.Mike，asweexpected,attendedthemeeting.3.Shecameato

7、nce,whichsurprisedmeverymuch.4.Thegirlheardaterriblenoise,whichbroughtherheartintohermouth.结构不同 ( as 常用于一些固定结构中，类似插入语，而which 常用于which +谓语+宾语/ 宾补结构。第10页/共19页第11页/共19页1. I still remember the days _ I worked with the farmers. I still remember the days _ I spent with the farmersA.which B. on which C. wh

8、en D. what2. We were on the way _ it began to rain. I dont like the way _ you speak to your parents. A. when B. that C. how D. which whenwhichwhenthat第12页/共19页3. The teacher didnt know the reason _ she was absent yesterday.The teacher couldnt accept the reason _ she explained yesterday.A. how B. why

9、 C. that D. who4. Is this school _ you ever visited? Is this the school _ you ever studied? Is this the school in _ you ever studied? A. where B. which C. that D. the onewhythatDAB第13页/共19页5. This is _ he said at he meeting yesterday. This is all_ he said at the meeting yesterday. A. that B. which C

10、. what D. how6. _ is reported in the newspapers, they have beaten all the other teams. _ is reported in the newspaper that they have beaten all the other teams._ is reported in the newspaper is that they have beaten all the other teams. A. It B. As C. Which D. What CABAD第14页/共19页7. That is the house

11、, _ windows hasnt been cleaned for months. That is the house, _ the windows hasnt been cleaned for months. That is the house, but _ windows hasnt been cleaned for months. A. its B. its C. whose D. of whichCDA第15页/共19页8. John said hed been working in the office for hours, _ true. John said hed been w

12、orking in the office for hours, but _ true. A.he was B. it was C. which was D. who was CB第16页/共19页第17页/共19页 相同之处： 当先行词指整个主句的意思时, 这类非限制性_只能由_或 _来引导。两者的区别在于：1. which引导的定语从句只能位于_, 而as引导的定语从句可位于_。（位置）2. _常译作“这”; 而_常译作“正如”, 且多与see, expect, imagine, know, hope等动词连用。（含义）3. 在定语从句中作主语时, 若用_, 其谓语部分一般有be; 若谓语是不含be的行为动词时, 要用_。4. _引导的定语从句只表示一个众所周知或意料之中的事, 而which不受此限制。5. as常用于固定搭配中:as is often the case (这是常有的事), as we expect