英語(yǔ)介詞 at、on和in可以表示地點(diǎn)（place）,，但他們的用法卻往往容易混淆,。

三者的主要區(qū)別如下。

AT

1. At：把某個(gè)位置或地點(diǎn)看作一個(gè)點(diǎn)（point）

I was sitting at my desk. （桌子是我坐的一個(gè)點(diǎn)）

2. At：把公司或工作場(chǎng)合看作活動(dòng)地點(diǎn)

How many people are working at Microsoft? （微軟公司是工作的場(chǎng)所）

3. At：有很人參與的活動(dòng)場(chǎng)所

Were you at Lisa's party? (at the cinema/at the theatre)（聚會(huì),、電影院,、劇院都有很多人觀看）

4. At：學(xué)校，如school,、college,、university

She always did well at school.

5. At：地址

They once lived at number 12 South George's Street.

6. At：在我們獲得各種服務(wù)的公共場(chǎng)地,，如理發(fā)店、醫(yī)院,、商店,、飯店等

I can't meet at four. I'll be at the hairdresser's until five.

ON

1. On：在..上面

I know I left my wallet on the table.

2. On：沿著道路或河流,，或海邊或湖邊的位置

Dublin is on the east coast of Ireland.

3. On：建筑物的樓層

They live on the 15th floor!

4. On：在公共交通上

I was on the train when she phoned.

IN

1. In：在..里面

I know my book is somewhere in this room.

2. In：當(dāng)把工作場(chǎng)地看做一個(gè)實(shí)體建筑時(shí)

She works in an open-plan office.

3. In：在課堂上

He found it difficult to concentrate in class.

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