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1、1介词的用法介词的功能介词是一种虚词，用来表示名词或相当于名词的其它词语句中其它词的关系，不能单独使用。介词可与名词或相当于名词的其它词构成介词短语。介词短语可在句中作定语，状语，表语和宾语补足语。例如：The boy over there is Johns brother. (定语)The girl will be back in two hours. (状语)Our English teacher is from Australia. (表语)Help yourself to some fish. (宾语补足语)常用介词的用法辨析（1）表时间的介词1）at, in on表示时间点用at。例
2、如：at six oclock, at noon, at midnight。表示在某个世纪，某年，某月，某个季节以及早晨，上午，下午，晚上时，用in。例如：in the nineteenth century, in 2002, in may, in winter, in the morning, in the afternoon等。表示具体的某一天和某一天的上午，下午，晚上时，用on。例如：on Monday, on July 1st, on Sunday morning等。2） since, after由since和after 引导的词组都可表示从过去某一点开始的时段，但since词组表示的
3、时段一直延续到说话的时刻，因而往往要与现在完成时连用。而after词组所表示的时段纯系过去，因而要与一般过去时连用。例如：I havent heard from him since last summer.After five days the boy came back.3） in, afterin与将来时态连用时，表示“过多长时间以后”的意思，后面跟表示一段时间的词语。After与将来时态连用时，后面只能跟表示时间点的词语。After与过去时态连用时，后面才能跟表示一段时间的词语。例如：He will be back in two months.He will arrive after f
4、our oclock.He returned after a month.（2）表示地点的介词1）at, in, onat一般指小地方；in一般指大地方或某个范围之内；on往往表示“在某个物体的表面”。例如：He arrived in Shanghai yesterday.They arrived at a small village before dark.There is a big hole in the wall.The teacher put up a picture on the wall.2）over, above, onover, on和above都可表示“在上面”，但具体含义
5、不同。Over表示位置高于某物，在某物的正上方，其反义词是under。 above也表示位置高于某物，但不一定在正上方，其反义词是below。On指两个物体表面接触，一个在另一的上面。例如：There is a bridge over the river.We flew above the clouds.They put some flowers on the teachers desk.3） across, throughacross和through均可表示“从这一边到另一边”，但用法不同。Across的含义与on有关，表示动作在某一物体的表面进行。Throgh的含义与in有关，表示动作是在
6、三维空间进行。例如：The dog ran across the grass.The boy swam across the river.They walked through the forest.I pushed through the crowds.4) in front of, in the front ofin front of 表示“在某人或某物的前面”，在某个范围以外；in the front of 表示“在的前部”，在某个范围以内。例如：There are some tall trees in front of the building.The teacher is sitti
7、ng in the front of the classroom.介词的固定搭配介词往往同其他词类形成了固定搭配关系。记住这种固定搭配关系，才能正确使用介词。（1）介词与动词的搭配listen to , laugh at, get to, look for wait for, hear from, turn on, turn off, worry about, think of, look after, spendon, 等。（2）介词与名词的搭配on time, in time, by bus, on foot, with pleasure, on ones way to, in troub
8、le, at breakfast, at the end of, in the end等。（3）介词与形容词的搭配be late for, be afraid of, be good at, be interested in, be angry with, be full of, be sorry for等。2连词的用法连词的功能用来连接词，短语，从句或句子的词叫连词。连词是一种虚词，在句中不能单独使用。连词可分为两类：并列连词和从属连词。并列连词并列连词用来连接具有并列关系的词，短语或句子。常见的并列连词有：(1)表并列关系的and, bothand, not onlybut also, n
9、eithernor等。(2)表选择关系的or, eitheror等。(3)表转折关系的but, while等。(4)表因果关系的for, so等。从属连词从属连词用来引导从句。常见的从属连词有：(1)引导时间状语从句的after, before, when, while, as, until, till, since, as soon as等。(2)引导条件状语从句的if, unless等。(3)引导原因状语从句的because, as, since等。(4)引导目的状语从句的so that, in order that等。(5)引导让步状语从句的though, although, even
10、if等。(6)引导结果状语从句的so that, sothat, suchthat等。(7)引导比较状语从句的than, asas等。(8)引导名词从句的that, if , whether等。常用连词的用法辨析（1） while, when, as这三个连词都可引导时间状语从句，但用法有所不同。1) 当某事正在进行的时候，又发生了另一件事。While, when, as 都可用来引导表示“背景”的时间状语从句。例如：As/When/While I was walking down the street I noticed a police car.2) 当两个长动作同时进行的时候，最常用的是
11、while。例如：While mother was cooking lunch, I was doing my homework.3) 当两个动作都表示发展变化的情况时，最常用的是as。例如：As children get older, they become more and more interested in things around them.4) 当两个短动作同时发生时，或表示“一边一边”时，最常用as。例如：Just as he caught the fly, he gave a loud cry.She looked behind from time to time as sh
12、e went5) 当从句的动作先于主句的动作时，通常用when。例如：When he finished his work, he took a short rest.6) 当从句是瞬间动作，主句是延续性动作时，通常用when。例如：When John arrived I was cooking lunch.（2）as, because, since , for这四个词都可表原因，但用法有区别。1) 如果原因构成句子的最主要部分，一般用because。因此，because引导的从句往往放在句末。例如：I stayed at home because it rained.-Why arent yo
13、u going?-Because I dont want to.2) 如果原因已被人们所知，或不如句子的其它部分重要，就用as或since。Since比as稍微正式一点。As和since 引导的从句一般放在句子的开头。例如：As he wasnt ready, we left without him.Since I have no money, I cant buy any food.3) for用来补充说明一种理由，因此，for引导的从句几乎可以放在括号里。For引导的句子不放在句子的开头。例如：I decided to stop and have lunch-for I was feeli
14、ng quite hungry.（3）if, whetherif和whether都可作“是否”讲，在引导宾与从句是一般可互换。例如：I wonder whether (if) you still study in that school.I dont know whether (if) he likes that film.在下列情况下，只能用whether,不能用if：1) 引导主语从句时。例如：Whether he will come to the party is unknown.2) 引导表语从句时。例如：The question is whether I can pass the e
15、xam.3) 在不定式前。例如：I havent made up my mind whether to go there or not.（4）sothat, such.that1) sothat中的so是个副词，其后只能跟形容词或副词，而suchthat中的such是个形容词，后接名词或名词短语。例如：Im so tired that I cant walk any farther.It was such a warm day that he went swimming.2) 如果在名词之前有many, much, little, few时，用so,不用such。例如：He has so li
16、ttle education that he is unable to get a job.I have had so many falls that I am black and blue all over.（5）eitheror, neithernor, not onlybut also这三个连词词组都可连接两个并列成分。当它们连接两个并列主语时，谓语动词要随相邻的主语变化。例如：Either you or he is wrong.Neither he nor his children like fish.Not only the teacher but also the students
17、 want to buy the book.（6）although, but这两个连词不能用在同一个句子中。例如：我们不能说“Although he isover sixty, but he works as hard as others.”这个句子应改为：Although he is over sixty, he works as hard as others.或He is over sixty, but he works as hard as others.（7）because, so这两个连词同样不能用在同一个句子中。例如：我们不能说“Because Johnwas ill, so I
18、took him to the doctor.” 这个句子应改为Because John was ill, I took him to the doctor.或John was ill, so I took him to the doctor.【实例解析】1. -When will Mr Black come to Beijing? -_ September 5. A. On B. To C. At D. In 答案：A。表示时间的介词的用法。表示某一天用介词on。2.The boys felt sad as they lost _ the girls in the talk show. A.
19、 by B. in C. to D. on答案：C。该题考查的是介词和动词的固定搭配。lose表示输给谁的时候用介词to。应选C。3.-I like riding fast. Its very exciting. -Oh! You mustnt do it like that, _ it may have an accident. A. and B. or C. so D. but答案：B。该题考查的是并列连词的用法。答语的意思是“你不要那样做，否则会发生事故的。”在这四个并列连词中，只有or含有这样的意思，所以应选B。4. John fell asleep _ he was listenin
20、g to the music. A. after B. before C. while D. as soon as 答案：C。该题考查的是引导时间状语从句的常用从属连词的用法。本句的含义是“约翰在听音乐的时候睡着了。”表示在干某事时发生了某个事情” 通常用while。因此应选C。【中考演练】一、单项填空1. We traveled overnight to Paris and arrived _ 5 oclock _ the morning. A. on; in B. at; in C. at; on D. in; on2. Wheres Lily? We are all here _ her
21、. A. beside B. about C. except D. with3. She sent her friend a postcard _ a birthday present. A. on B. as C. for D. of4. Jack has studied Chinese in this school _ the year of 2000. A. since B. in C. on D. by5. -What is a writing brush, do you know? -Its _ writing and drawing. A. with B. to C. for D.
22、 by6. English is widely used _ travellers and business people all over the world. A. to B. for C. as D. by7. _ the help of my teacher, I caught up with the other students. A. Under B. In C. With D. On8. Hong Kong is _ the south of China, and Macao is _ the west of Hong Kong. A. in; to B. to; to C. t
23、o; in D. in; in9. -Youd better not go out now. Its raining. -It doesnt matter. My new coat can keep _ rain. A. in B. of C. with D. off10. Japan lies _ the east of China. A. to B. in C. about D. at11. -Will the foreigners have any problems talking with Chinese in 2008?-I dont think so. Now _ the youn
24、g _ the old can speak some English. A. eitheror B. not only but also C. neithernor D. bothor12. We didnt catch the train _ we left late. A. so B. because C. but D. though13. Tom failed in the exam again _ he wanted to pass it very much. A. if B. so C. though D. as14. I wont believe that the five-yea
25、r-old boy can read five thousand words _ I have tested him myself. A. after B. when C. if D. until15. The book was so interesting that he had read it for three hours _ he realized it. A. when B. until C. after D. before16. -This dress was last years style. -I think it still looks perfect _ it has go
26、ne out this year. A. so that B. even though C. as if D. ever since17. Hurry up, _ you will miss the train. A. and B. so C. however D. or18. The mountain was _ steep _ few people in our city reached the top. A. soas B. sothat C. asas D. tooto19. -Do you remember our pleasant journey to Xian? -Of cour
27、se. I remember everything _ it happened yesterday. A. as soon as B. even though C. rather than D. as if20. _ you cant answer this question, we have to ask someone else for help. A. Although B. While C. Whether D. Since二、用适当的介词填空1. -How are you going to the train station to meet your aunt? -Im going
28、there _ my car.2. Mum, today is Mothers Day. Mike and I want to invite you to have dinner _ us at Zhonglou Restaurant.3. Hangzhou is famous _ the West Lake.4. Today some newly-produced mobile phones can take pictures _ a camera.5. Could you tell me if there is a flight to the capital _ March, 25th?6
29、. We all agree _ you. Lets start at once.7. There is a big shop _ the other side of the road.8. -Which necklace have you lost? -The one you gave me _ my birthday.9. You should take more exercise. Its good _ your health.10. It is clear that fish cannot live _ water.三、用适当的连词填空1. _ they are brothers, t
30、hey dont look like each other at all.2. The dress was very expensive, _ I didnt buy it.3. -Do you know _ I could pass the exam? -Sorry, Ive no idea.4. Mr. Brown knows little Japanese, _ he cant understand the instructions on the bottle of the pills.5. The war was over about a year ago, _ the America
31、n soldiers in Iraq are still having a lot of trouble to deal with.6. -Is David at school today? -No. He is at home _ he has a bad cold.7. _ Lily _ Lucy may go with you because one of them must stay at home.8. Study hard, _ you are sure to have a good result in the exam.9. Please have a wash _ you go
32、 to bed.10. The twins have learned a lot _ they came to China.【练习答案】一. 1.B 2.C 3.B 4.A 5.C 6.D 7.C 8.A 9.D 10.A 11.B 12.B 13.C 14.D 15.D 16.B 17.D 18.B 19.D 20.D二. 1.in 2.with 3.for 4.like 5.on 6.with 7.on 8.for 9.for 10.without三. 1.Although/ Though 2.so 3.if/ whether 4.so 5.but 6.because 7.Eitheror 8.and 9.before 10.since