介词用法
介词是英语中最活跃的词类之一。同一个汉语词汇在英语中可译成不同的英语介词。例如汉语中的可译成:(1)用英语(in English);(2)用小刀(with a knife);(3)用手工(by hand);(4)用墨水(in ink)等。所以,千万不要以为记住介词的一两种意思就掌握了这个介词的用法,其实介词的用法非常广泛,搭配能力很强,越是常用的介词,其含义越多。下面就简单介绍几组近义介词的用法及其搭配方法。
. in, to, onoff在方位名词前的区别
1. in表示A地在B地范围之内。如:
Taiwan is in the southeast of China.
2. to表示A地在B地范围之外,即二者之间有距离间隔。如:
Japan lies to the east of China.
3. on表示A地与B地接壤、毗邻。如:
North Korea is on the east of China.
4. off表示……一些距离或离……不远的海上。如:
They arrived at a house off the main road.
New Zealand lies off the eastern coast of Australia.

. at, in, on, bythrough在表示时间上的区别
1. at指时间表示:
1)时间的一点、时刻等。如:
They came home at sunrise at noon, at midnight, at ten o’clock, at daybreak, at dawn.
2)较短暂的一段时间。可指某个节日或被认为是一年中标志大事的日子。如:
He went home at Christmas at New Year, at the Spring Festival, at night.
2. in指时间表示:
1)在某个较长的时间(如世纪、朝代、年、月、季节以及泛指的上午、下午或傍晚等)内。如:
in 2004, in March, in spring, in the morning, in the evening, etc
2)在一段时间之后。一般情况下,用于将来时,谓语动词为瞬间动词,意为……以后。如:
He will arrive in two hours.
谓语动词为延续性动词时,in意为……以内。如:
These products will be produced in a month.
注意:after用于将来时间也指一段时间之后,但其后的时间是一点,而不是一段。如:
He will arrive after two o’clock.
3. on指时间表示:
1)具体的时日和一个特定的时间,如某日、某节日、星期几等。如:
On Christmas DayOn May 4th, there will be a celebration.
2)在某个特定的早晨、下午或晚上。如:
He arrived at 10 o’clock on the night of the 5th.
3)准时,按时。如:
If the train should be on time, I should reach home before dark.
4. by指时间表示:
1)不迟于,在(某时)前。如:
He will come by six o’clock.
Jack had made some friends by the time you came.
2)在……间,在……的时候。如:
He worked by day and slept by night.
5. through指时间意为……开始到结束,此时与throughout相同。如:
We work hard all through the year.

. near, by, beside, at表示……附近时的区别
1. near表示相对的近,实际距离可能还很远。如:
Suzhou is near Shanghai.
2. bybeside都表示靠近,实际距离不可能很远,但besideby更具体地表示出……旁边的意思。如:
He was sitting beside her.
3. at也有在旁边的意思,但多表示有目的的行为所处的位置,而bybeside仅表示位置关系。如:
The students are sitting at the desks listening to the teacher.
Several students are sitting by / beside the window talking about a film.


. at, inon表示地点时的区别
1. at表示地点:
1)用于指较小的地方。如:
I shall wait for you at the station.
2)用于门牌号码前。如:
He lives at 115 Zhongshan Road.
2. in表示地点:
1)用于指较大的地方。如:
He lives in Shanghai.
2)虽然是很小的地方,如果说话人住在那里,也可用in。商店、学校、机关等,若看作一个地点(point)用at,若看作一个场所(place)用in。如:
I met him at the post-office.
I’m now working in the post-office.
3. on表示地点,一般指与面或线接触,意为……上;在……。如:
The picture was hanging on the wall.
New York is on the Hudson River.

. besides, except, except for, but表示……之间的区别
1. besides表示除了……以外,还有……”,具有附加性质。如:
Besides Mr Wang, we also went to see the film.(王先生也去了)
注意:besides用于否定句中时,与except, but同义,可互换。如:
We have no other books besides / except these.
2. except表示“……除外,具有排它性质。如:
We all went to see the film except Mr Wang.(王先生没去)
3. except for表示除了……”,即表示除去整体中的一部分。如:
The composition is very good except for a few spelling mistakes.
4. but意为除了,与except同义,except强调被排除的部分,but则强调整句的内容,常修饰否定意义的代词。如:
Nobody knew it but me.


. above, over, on, up表示……之间的区别
1. above“……上方,表示相对高度,不一定在正上方,其反义词为below。如:
We’re flying above the clouds.
2. over……正上方,表示垂直上方,其反义词为under。如:
The bridge is over the river.
3. on表示……上面,与物体表面接触,与beneath相对。如:
There is a map on the wall.
The earth felt soft beneath our feet.
4. up表示动作的方向往上,反义词为down。如:
Please hang the picture up.

. by, through, with表示方式、方法、手段之间的区别
1. by表方式:
1)表示以一般的方法或方式。如:
No one in those days could live by writing poems.
2)表示传达、传递的方式或煤介。如:
How did you send the letter, by airmail or by ordinary mail?
3)表示用交通工具、通讯工具后接名词单数,不加冠词。如:
He came by train, but his wife came by bus.
注意下面两句的区别:
Did you come by train?
Did you come in his car / on my bike?
“by +抽象名词构成的词组有:by accident / by chance / by diligence / by effort / by force / by heart / by luck / by mistake / by hard work.
2. through表示以;通过;经由。如:
He succeeded through hard work.
3. with表示方式
1)表示行为方式,意为以;带着;用。如:
We are well provided with food and clothing.
2)表示使用具体的工具或手段。如:
He writes with a pen.
注意:在表示手段时,by, through, with有时也可换用,但with的意思更明确。如:
Through / By / With his efforts he succeeded in making so many useful inventions.

. through, with, from, for, at表示原因的区别
1. through表示原因,作因为解,常和neglect, carelessness, mistake, fault等词连用,表示偶然或消极的原因,如疏忽、过错、不慎等。如:
He cut himself through carelessness.
The experiment failed through one fault of ours.
2. with表示原因,指由于外界而影响到内部,意为因为;由于。如:
The little girl was shivering with cold.
3.
from表示动机、疲劳、痛苦、死亡等原因。如:
She did it from a sense of duty.
4. for常表示为了某一目的、事业的原因。如:
Forgive me for keeping you waiting.
5. at表示原因,指听到;看到;想到等。如:
At the news they felt very glad.

. 介词的搭配方式
1. 介词可与名词搭配。如:answer to, key to, the reason for, the cause of, advice on, by means of, lack of, a picture of等。
2. 介词可与形容词搭配。如:be afraid of, be active in, be tired of, be bored with, be prepared for, be suitable for, be familiar to / with, be free from等。
3. 介词可与动词搭配。如:talk about, prevent…from, belong to, get over, depend on, object to, refer to, look forward to, make up for, devote to
  一些容易混淆的介词
    1.表示时间的atonin的用法区别
    at主要表示:
    (1)在某具体时刻之前,如at seven o’ clockat 730
    (2)在固定短语中,如:at noonat nightat that timeat the age of at the weekendat Christmas
    On用来表示……,如:On MondayOn May lstOn Children’s Day
    in用来表示:
    (1)在某年、某月、某季节。
    (2)段时间之后,如:in two hoursin a few days
    注意:在纯粹地表示在上午/下午/晚上时,用in the morningafternoonevening,但在某一天的上午、下午、晚上前要用介词on。如:on Monday morningon the morning of Children’ s Day
    2. 表示地点的atinon的用法区别
    (1) at通常指小地方,in一般指大地方。
    (2) at 所指范围不太明确,in……
    (3) in指在内部,on……之上
    3.表示一段时间forsince的用法区别
    for后面接时间段,since之后接时间点。
    4.表示时间的beforeby的用法区别
    beforeby都可表示……之前,但by含有不迟于……”……为止的意思。如果by后是将来的时间,则与将来时连用,若by后是过去的时间,则与过去完成时连用。
    5overabove(underbelow)
    overabove都表示……的上面over表示正上方,而above只表示在上方但不一定在正上方above还可表示温度、水位等below反义词高于over还可表示越过……”over的反义词是underabove的反义词是below.例如:
    There is a bridge over the river
    Our plane flew above the clouds
    6.表示withbyin的用法
    with多指用工具,用身体的部位或器官;by表示使用的方法、手段;in指使用某种语言。如:
    We see with our eyes.
    We go there by bike.
    Please say it out in English.
    He cut it open with a knife.
介词的省略
    表示时间介词at, on, in 的省略
    (1) next, last, this, these, today, yesterday, tomorrow, one, every, each, all等词前,一般不用 at, in, on.
    (2) 在某些名词词组前,可以省略(也可不省): (on) that day, (in)the year before last
    常见搭配
    1.动词+介词,如:
    listen to, laugh at, write to, hear from, get to, look at, shout at, shout to, knock at, look for, look at, ask for, wait for, get on, get to, put on, turn on, operate on, take off, turn off, learn from, worry about ...
    2.形容词+介词,如:
    afraid of, full of, angry with, strict with, busy with, good at, good/bad for, late for, sorry for, ready for, famous for, polite to,
    3.名词+介词 / 介词+名词
    key to, visit to, at home, in surprise, after class, for ever, on time, at last, at first,