常用介词的区别
1、 at
如： 常用词组有： at noon, at night
表示时间的 at, in, on：表示片刻的时间，at 8 o'clock，at midnight, at the end of, at that time, at the beginning of, at the age of, at Christmas, at New Year 等。
in 表示一段的时间
如：in the morning, in the afternoon, in the evening, in October, in 1998, in summer, in the past, in the future 等。
on 总是跟日子有关，on Monday, on Christmas morning, on the following, on May Day, on a warm morning 等。
2、表示时间的 since 和 from：since 表示从过去到现在的一段时间的过程，常与现在完成时连用：from 表示从时间的某一点开始，不涉及与现在的关系。一般多与现在时、过去时、将来时连用。
如：I hope to do morning exercises from today./ We have not seen each other since 1995.
3、表示时间的 in 和 after：两者都表示“在(某个时间)之后，区别在于in表示“在(一段时间)之后” ，而 after 则表示“在(某一具体时间点之后)，in 短语和将来时态连用，after 短语和过去时态或将来时态连用。
如：We'll be back in three days.
After seven the rain began to fall.
What shall we do after graduation?
After two months he returned. 注意：after 有时也可以表示在一段时间之后(常用在过去时里)
4、表示地理位置的 in, on, to：in 表示在某范围内，on 指与什么毗邻，to 指在某环境范围之外
如：Changchun is in the northeast of China./ Mongolia is on the north of China./ Japan is tothe 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，表示……上
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“穿过……”的 through 和 across：through 表示从内部通过，与 in 有关;across 表示“穿过……”，表示从一端至另一端在表面上的通过，与 on 有关。常用介词的区别
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 corn 表示在落，in 指角的内面;on the corner 表示“在角上” ，on 指的不是内面，也不是外面，而含内外兼有之意;at the corner指“在拐角处” 指的是拐角外附近的外面。
如：The lamp stands in the corner of the room./ I met at 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”“终于”解，可单独使用，后不接介词 of;at the end of 表示“在……末梢”“到……尽头” ，既可指时间，也可以指地上或物体。不可单独使用;by the end of 作“在……结束时”“到……末为止”解，只能指时间，不可单独使用。
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“关于”的 about 和 on：两者都有“关于”的意思，不过前者为一般用词，而后者表示“关于” ，为较正式的 “论述”
如：He came to tell me about something important./ He wrote a book on science
10、between, among：一般说来，between 表示两者之间，among用于三者或三者以上的中间。常用介词的区别
如：You are to sit between your father and me./ He is always happy among his classmates.
注意：但有时说的虽然是三个以上的人或东西，如果强调的是两两相互间接关系，适用于between。
如：Agreements were made between the different countries. 在谈到一些事物或一组事物，
而把它们视为分居两边时用 between。
如：The little valley lies between high mountains.
在谈事物 间的差别时，总是用 between。
如：They don't know the difference between wheat, coats and barley.
11、besides, except, but, except for：
besides 指除了……还有
如：All went out besides me
except 指“除了，减去什么” ，不能放在句首。
如：All went out except me.
but 与 except 意思近似，表示“除了……外”经常用在 no, all, nobody, anywhere, everything 等和其他疑 问词后面。
如：I never saw him reading anything but the newspaper.;
except for 表示“如无……就， 只是”表明理由细节。
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” 、表示“ ，用 with，而表示材料、方式、方法、度量、单位、语言、声音等的 “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、charge of 和 in the charge of：in 两者都表示 “由谁负责、照顾、管理” 区别在于： charge of 后接被照管的人或物， in the charge of 后面则跟照管的人。
如：Who is in charge of the project
The project is in the charge of an engineer
14、as, like：as 作“作为”“以……地位或身份”解。
如：Let me speak to you as a father.(事实是父亲)
like 作“象……一样”解
如：Let me speak to you like a father.(事实上不是父亲)
15、in front of 和 in the front of：in front of = before，是“在……前面”的意思(不在某物内)
in the front of 则是“在……前部”的意思(在某物内)
如：There is a desk in front of the blackboard./ The boy sat in the front of the car.
16、in, into：into 表示动向，不表示目的地或位置。介词
如：We walked into the park.;in 通常表示位置。
We walked in the park;
in 和 drop, fall, put, throw, break 等终止性动词连用时，也可以表示动向。
如：I have put the coin in (into) my pocket.我把硬币放进衣袋。