介詞又叫前置詞，是一種虛詞。介詞分為三種，一種是簡單介詞，如at, in, on, beside, to , for等；另一種是短語介詞，即由兩個以上的詞組組成的短語，如in front of, because of, out of, instead of等；還有一種叫二重介詞，如until after, from behind等。
（一）介詞的句法功能
介詞不能獨立在句中做成份，介詞后必須與名詞、代詞、或動名詞構(gòu)成介詞短語在句中充當(dāng)一個成份，表示人、物、事件等與其它人、物、事件等之間的關(guān)系。
1、作定語：The book on the table is mine.
2、作狀語：We have breakfast at seven.（表時間）；They were late for meeting because of the heavy rain.（表原因）；They started the machine by pressing the button.（表方法）
3、作表語：My dictionary is in the bag.
4、作賓語補(bǔ)足語：I found him in the office.
（二）主要介詞區(qū)別
1、表示時間的at, in, on：at表示片刻的時間，如：at 8 o’clock ，常用詞組有：at noon, at night, at midnight, at the end of, at that time, at the beginning of, at the age of, at Christmas, at New Year等。in表示一段的時間，如：in the morning, in the afternoon, in the evening, in October, in 1998, in summer, in the past, in the future等。on總是跟日子有關(guān)，on Monday, on Christmas morning, on the following, on May Day, on a warm morning等。
2、表示時間的since和from：since表示從過去到現(xiàn)在的一段時間的過程，常與現(xiàn)在完成時連用。from表示從時間的某一點開始，不涉及與現(xiàn)在的關(guān)系。一般多與現(xiàn)在時、過去時、將來時連用。如：I hope to do morning exercises from today./ We have not seen each other since 1995.
3、表示時間的in和after：兩者都表示“在（某個時間）之后，區(qū)別在于in表示“在（一段時間）之后”，而after則表示“在（某一具體時間點之后）”，in短語和將來時態(tài)連用，after短語和過去時態(tài)或?qū)頃r態(tài)連用。如：We’ll be back in three days./ After seven the rain began to fall./ What shall we do after graduation?
注意：after有時也可以表示在一段時間之后（常用在過去時里）。如：After two months he returned.
4、表示地理位置的in, on, to：in表示在某范圍內(nèi)，on指與什么毗鄰，to指在某環(huán)境范圍之外。如：Changchun is in the northeast of China./ Mongolia is on the north of China./ Japan is to the east of China.
5、表示“在……上”的on和in：on只表示在某物的表面上，而用in表示占去某物一部分。 如：There is a book on the piece of paper./ There is an interesting article in the newspaper./ He dug a hole in the wall.
6、表示“穿過……”的through和across：through表示從內(nèi)部通過，與in 有關(guān)；across則表示從一端至另一端在表面上的通過，與on有關(guān)。如： Water flows through the pipe./ The old man walked across the street.
7、in the corner, on the corner, at the corner：in the corner 表示在角落里，in指角的內(nèi)面；on the corner表示“在角上”，on指的不是內(nèi)面，也不是外面，而含內(nèi)外兼有之意；at the corner指“在拐角處”，at指的是拐角外附近的外面。如：The lamp stands in the corner of the room./ I met with him at the street corner./ He sat on the corner of the table.
8、in the end, at the end of, by the end of：in the end作“最后”、“終于”解，可單獨使用，后不接介詞of；at the end of 表示“在……末梢”，“到……盡頭”，既可指時間，也可以指地上或物體。不可單獨使用；by the end of 作“在……結(jié)束時”，“到……末為止”解，只能指時間。不可單獨使用。如：In the end they reached a place of safety./ At the end of the road stands a beautiful garden./ They decided to have an English evening at the end of this week./ by the end of last month he had finished the novel.
9、表示“關(guān)于”的about 和on：兩者都有“關(guān)于”的意思，不過前者為一般用詞，而后者為較正式的“論述”。如：He came to tell me about something important./ He wrote a book on science.
10、between, among：一般說來，between表示兩者之間，among用于三者或三者以上的中間。如：You are to sit between your father and me./ He is always happy among his classmates.
注意：但有時說的雖然是三個以上的人或東西，如果強(qiáng)調(diào)的是兩兩相互間接關(guān)系，適用于between。如：Agreements were made between the different countries. 在談到一些事物或一組事物，而把它們視為分居兩邊時用between。如：The little valley lies between high mountains.。在談事物間的差別時，總是用between。如：They don’t know the difference between wheat, oats and barley.
11、besides, except, but, except for：besides指“除了……還有，再加上”。如：All went out besides me.；except指“除了，減去什么”，不能放在句首。如：All went out except me.；but 與except意思近似，表示“除了……外”經(jīng)常用在no, all, nobody, anywhere, everything等和其他疑問詞后面。如：I never saw him reading anything but the newspaper.；except for表示“如無……就，只是”表明理由細(xì)節(jié)。如：His diary is good except for a few spelling mistakes.。
12、表示“用”的in和with：表示工具的“用”，用with，而表示材料、方式、方法、度量、單位、語言、聲音等的“用”，用in。如：He is writing a letter with a pen./ He wrote the letter in pencil./ We measured it in pounds./ Read the text in a loud voice./ Tell me the story in English.
13、in charge of和in the charge of：兩者都表示“由誰負(fù)責(zé)、照顧、管理”。區(qū)別在于：in charge of后接被照管的人或物，而in the charge of后面則跟照管的人。如：Who is in charge of the project?/ The project is in the charge of an engineer.。
14、as, like：as作“作為”、“以……地位或身份”解。如：Let me speak to you as a father.（事實是父親）；like作“象……一樣”解。如：Let me speak to you like a father.（事實上不是父親）。
15、in front of 和in the front of：in front of = before，是“在……前面”的意思（不在某物內(nèi)）； in the front of則是“在……前部”的意思（在某物內(nèi)）。如：There is a desk in front of the blackboard./ The boy sat in the front of the car.。
16、in, into：into表示動向，不表示目的地或位置。如：We walked into the park.；in通常表示位置。如：We walked in the park；in和drop, fall, put, throw, break等終止性動詞連用時，也可以表示動向。如：I have put the coin in (into) my pocket.我把硬幣放進(jìn)衣袋。
練習(xí)（一）、介 詞
1. The teacher is writing ____ a piece of chalk on the blackboard while the students are writing ____ink in exercise books. A. with, in B. in, with C. in, in D. with, with
2. The worker can make chairs ____ wood, and also can make paper ____ wood.
A. from, of B. of, from C. of. of D. from, from
3. Mary dropped in ____ Mr Smith, but he wasn' t at home, so she went to drop in ____ Mr Smith's office. A. on, on B. at, at C. on. at D. at. on
4. The teacher is not only strict ____ his pupils but also strict ____ his own work.
A. with, with B.in,in C. in, with D. with, in
5. His grandfather died ____ the wound that the enemy soldier had given him .and then his grand-
mother died ____ hungry and cold. A.from,of B.of,from C.from,from D.of.of
6. If you run ____ two hares you will catch neither. A.into B.after C.off D. out of
7. This is a common mistake ____ students. A. between B.over C. among D. about
8. My father began to work ____ a bus driver when he was twenty years old.
A.for B.to C.at D.as
9. _____ hearing the news, I was wild ____ joy. A. At, in B. On, with C. After, by D. /, over
10.I don' t think Xiao Li is ____ the other students ____ mathematics.
A. after, on B. after, with C. behind, in D. behind, at
11. Nobody knows it ____ me. A. except for B. except that C. besides D. but
12. The window is never opened ____ in summer. A. but B. except C. except for D. but for
13. It happened ____ the Long March. A. during B.in C.at D.for
14. We go to school ____ a bike. A.in B.on C.by D.ove
15. It's very kind____ you to repair the bike ____ me.
A.for.for B.of,of C.of,for D.for,of
16. Fresh air is good ____ your health. A.at B.for C.of D.to
17.The boy is waiting ____ his sister and they will go to the hospital to wait ____ their sick mother.
A.for,on B.on,for C.for,for D.on.on
18.The group is made up____five students. And they are studying hard to make up____ the lost time.
A.of,of B.for,for C.of,for D.for,of
19.The PLA man saved the boy ____ death. A. of B.from C.to D.on
20. He will come ____ three days. A.before B.after C. in D. later
21. He went to Beijing and returned ____ three days.
A. in B. before C. later D. after
22. He will return____ three o'clock. A.after B.in C.on D.at
23. He wrote the article ____ three days. A.at B.in C.on D.by
24.I agree ____ what you said. A.to B.on C.with D.at
25. Do you agree____ this plan (arrangement)? A.at B.with C.on D.to
26. Finally they agreed ____ the terms of the contract. A.on B.to C.with D.at
27. Do you often hear____ your brother? A. of B. from C. out of D. about
28.1 heard ____ the book long ago, but I have never read it.
A. out B.from C.of D.with
29. The plane flew ____ the city. A. across B.past C. through D.over
30. We walked ____ the Tian An Men Square to the Museum of Chinese History.
A. across B. through C.by D.past
31.I was wandering ____ the streets when I caught sight of a tailor's shop.
A. across B. through C.by D.past
32. Our bus drove ____ the Great Hall of the People.
A. across B. through C. past D.over
33. ____ the sun, nothing would grow.
A. For B.With C. Under D. Without
34. The teacher is busy ____ teaching.
A.with B.for C.on D.of
35. The teacher is busy ____ correcting papers.
A. for B.in C.on D.of
36. We left Xi' an _.___ a very hot summer afternoon.
A. on B.in C. during D.by
37. She felt disappointed when she found out they had gone swimming____ her.
A. but B. except C. except for D. without
38. His teacher was angry ____ him ____ his being late.
A.at,with B.at,for C.with,for D.with,about
39. My father was disappointed ____ the news.
A. by B. about C. at D. on
40. Mr Wang went to Nanjing ____ October,1998 and came back home ____ the morning of Nov. 5.
A.at;in B.on;at C.in;on D.by;from
41 .My uncle lives ____ 105 Huanghe Street. His room is ____ the fifth floor.
A.at;on B.td;at C.on;in D.of;to
42. I don't think you can work out the maths problem ____ the teacher's help.
A. since B. unless C. because D. without
43. He is running ____ the wind towards the east of the station ____ Tom is running ____ the right.
A. down; and; on B. against; while; on C.for;with;in D. with; while; to
44. In Hangzhou Mr Green was so struck ____ the beauty of nature that he stayed ____ another night.
A.at;on B.with;at C.for;in D.by;for
45. Many people are still ____ the habit of writing silly things ____ public places.
A.at;at B.in;in C.into;of D.during;at
46. - Do you go there ____ bus? - No, we go there ____ a train.
A. in; on B.on;on C.by;in D.by; with
47. I made the coat ____ my own hands. It was made ____ hand, not with a machine.
A. in; in B.in; with C. with; by D. with; with
48. The trees ____ front of the house are ____ the charge of Old Li.
A. in; in B. at; in C. in; by D. from; in
49. The old man died ____ cold ____ a cold night.
A. from; at B.of;in C.of;on D. for; during
50. Does John know any other foreign languages ____ French?
A. except B. but C. besides D. beside
51. He looked quite healthy ____ he was ____ the age of seventy.
A. when; at B. because; in C. if; for D. though; at
52. - How long has the bookshop been in business? -____1982.
A. After B.In C.From D.Since
53. Did you have any trouble ____ the post office?
A. to have found B. with finding C. to find D. in finding
54.To tell you the truth, I have nothing to do ____ it.
A.about B.with C.for D.of
55. Something must be done to prevent our city ____ by thick smoke.
A. to be polluted B. from polluting C. from being polluted D. polluting
56.____ the students likes the paintings. Which is wrong?
A. The teacher as well as B. Nobody but C. The teacher besides D. All except
57. Henry,____ Mary and Tom, is coming to China for a visit. Which is wrong?
A. together with B. like C. and not D. but in addition to
58. Taiwan is ____ the east of Fujian.
A. in B.at C.to D.on
59. His father will be back from London ____ a few days.
A.since B.in C.on D.after
60. We offered him our congratulations ____ his passing the college entrance exams.
A.at B.on C.for D.of
61 .The word "write" has the same pronunciation ____ the word "right".
A. of B.as C.to D.from
62. The train leaves ____ 6: 00 p. m. So I have to be at the station ____ 5:40 p. m. at the latest.
A. at; until B. for; after C.at;by D. before; around
63. Go ____ the gate and you' 11 find the entrance ____ the park ____ the other side.
A. through; to; on B. along ;of; on C. down; to; at D. up; of; by
64. One ____ five will have the chance to join in the game.
A. within B. among C. in D. from
65. Because of her devotion _____ music, she has become friendly with Mr. Zhang.
A. in B. to C. with D. on
66. What idea can a man who is blind from birth have_____ color?
A. in B. / C. with D. of
67. Some people say that we live _____ the age of computers.
A. in B. at C. with D. for
68. ---May I attend your lecture, Mr. Green? ---Welcome _____ open arms.
A. with B. by C. in D. for
69. _____ defeated, they didn't lose heart.
A. In spite of B. Except for C. Though D. Until
70. I saw Jack yesterday. He told me that he would stay here _____ the end of this year.
A. at B. by C. for D. till
71.The train leaves at 6:00 p.m. So I have to be at the station ____5:40p.m.at the latest.
A. until B. after C. by D. around ('97NMET 11)
72. The boy ought to have gone to school ___, but he slept ___noon.
A. in the morning, at B. that morning, at
C. in that morning, until D. that morning, until ('93 上海)
73. The doctor will be free ____.
A. 10 minutes later B. after ten minutes
C. in ten minutes D. 10 minutes after('92MET. 20)
74. _____most students, she was always well prepared and never came to class late.
A. Like B. As C. For D. To ('98上海高考題 2)
75. Let's walk over ___the shop on the other side of the street.
A. in B. to C. under D. by ('93上海)
76. The number of the employees has grown from 1,000 to 1,200. This means it has risen ____20 percent. A . by B. at C. to D. with ('99 上海高考)
77. ____production up by 60%, the company has had another excellent year.
A. . As B. For C. With D. Through (2000NMET. 18)
78. Does John know any other foreign language ___French?
A. except B. but C. besides D. beside ('89MET. 13)
79. I know nothing about the young lady ___she is from Beijing.
A. except B. except for C. except that D. besides (2000 上海高考13)
80. ---You are so lucky. ---What do you mean ____that? (2002年春招)
A. for B. in C. of D. by