常用介词解析及用法比较：

　　at,on和in：这三个介词在试卷中的出现频率极高。对于它们的的分辨只要记住一句话就可以了。at表示点，on表示线，in表示面。什么意思呢?也就是说它们表达的范围逐渐增大。at six o'clock, at noon, at the age of sixteen等用at表示时刻或时间的点以及年龄。on具体到一周中的各天,日期及某特定的一天早上,下午,晚上：on Saturday，on July 1st，on my birthday，on the morning of July 16th，on a spring afternoon。in表达的范围更大一些。与世纪、年代、季节、月份以及早上、上午、晚上等连用。如：in the seventh century，in 1950's ,in 2000, in the morning等。

　　for,since：for表示多长时间。since后接时间起点,其终点往往为现在，常与完成时连用。牢牢记住哟。

　　after, in ：这两个介词都可以表示时间"在以后"的意思。其区别是：after 以过去为起点，表示过去一段时间之后，常用于过去时态的句子;in 以现在为起点，表示将来一段时间以后，常用于将来时态的句子。

　　by，with，in：by表示"以...的方式，方法，手段" 和 "乘某种交通工具";with指"借助于具体的手段或工具";in 表示"以......方式，用语言，文字等媒介"。

　　for和of：试比较：It's impossible for me to watch TV after eleven o'clock. It's kind of you to help me.

　　两句中介词的选择依据其前形容词而定,一般来说,of之前的形容词往往是用于描写人的品质的好坏，人自身的特点，如聪明与否，细心与粗心等;for之前的形容词用于描写事物的特点，如可能性，必然性，难易程度等。

　　好，又到了趁热打铁的时间了，来检测一下你的学习成效如何?

　　练习：

　　1. Can you tell the story ______Russian?

　　A. with

　　B. in

　　C. on

　　D. by

　　2. Here are some birthday cards ______ our teachers, ______ our best wishes.

　　A. of, with

　　B. for, with

　　C. of, in

　　D. for, in

　　3. The visitors _______Japan arrived _____ Beijing station last Tuesday morning .

　　A. from, at

　　B. of , to

　　C. from , to

　　D. of, on

　　4. He's badly hurt, we must send _____ a doctor at once.

　　A. to

　　B. up

　　C. on

　　D. for

　　5. Do you usually come to school ______ foot or _____- bike?

　　A. by ... by

　　B. on... on

　　C. on ... by

　　D. by ... on

　　6. --when was Jim born?

　　--______July, 18,1978.

　　A.on

　　B.at

　　C. in

　　D.to

　　7. WeiFang bought a new pen at a shop _____ her way home.

　　A. on

　　B. at

　　C. in

　　D. to

　　8. Don't tell anybody about it. Keep it a secret _______ you and me.

　　A. among

　　B. between

　　C. in

　　D. with

　　9. The teacher will be back ______ an hour.

　　A. in

　　B. after

　　C. of

　　D. at

　　10. -- How long have you been in Beijing ?

　　--I've been here _____ 1989.

　　A. in

　　B.since

　　C.on

　　D.for

　　实战：

　　1. ______man in brown is _____friend of my fathere's .

　　A. The.. the

　　B. The ... a

　　C. A... a

　　D. A... the

　　2. Here is a letter ______ you. It's ______your aunt.

　　A. to... for

　　B. for... to

　　C. from ... to

　　D. for ... from

　　3. The twins are ____ interested in Chinese food.

　　A. all

　　B. both

　　C. neither

　　D. each

　　4. It is ______ hot in Nanjing in summer.

　　A. too much

　　B. much too

　　C. much more

　　D. so much

　　5.That's too dear. Have you got_______?

　　A. cheaper something

　　B. everything cheaper

　　C. cheaper anything

　　D. anything cheaper

　　6. --Can I go out to play football now?

　　--No, you _______. You must do your homework first.

　　A. won't

　　B. can't

　　C. needn't

　　D. don't

　　7. The boy didn't go to bed _______ he was asked to.

　　A. while

　　B. since

　　C. until

　　D. as soon as

　　8. Lesson Two is ______ than Lesson One .

　　A. much difficult

　　B. much more difficult

　　C. the most difficult

　　D. little difficult

　　9. You'd better _______ here any longer.

　　A. don't stay

　　B. not to stay

　　C. to not stay

　　D. not stay

　　10. It _______ him half an hour to ride a bike to get here.

　　A. spent

　　B. used

　　C. took

　　D. paid

　　11. Mrs Read doesn't know ______ for her daughter.

　　A. what will she buy

　　B. which will she buy

　　C. to buy what

　　D. what she will buy

　　12. These childern have never seen snow, _______they?

　　A. do

　　B. don't

　　C. haven't

　　D. have

　　13. Why _______ shopping at once?

　　A. don't go

　　B. not go to

　　C. didin't go

　　D. not go

　　14. The Great Wall ______ all over the world .

　　A. is being known

　　B. was known

　　C. has known

　　D. is known

　　15. My friend has worked in that hospital_________.

　　A. since it opened

　　B. for it opened

　　C. since it opens

　　D. since it is open