一、at
1、用在表示地域面積不大的某個點的地方（如飯桌旁、電影院、車站、機場等）前（to refer to a position or location which we see as a point）
I was sitting at my desk. (當時我正坐在課桌旁。)
2、用在公司名稱（側重表達的是工作的單位，而不是工作地點）前（to talk about locations at companies, workplaces when we see them as a place of activity）
How many people are working atMicrosoft? (有多人在微軟工作？)
3、用在很多人參與的活動場合前（to refer to activities which involve a group of people）
Were you at Lisa’s party/the cinema/the theatre? (你當時在麗莎的聚會上/電影院裡/劇院裡嗎？)
4、用在學校前（with school/college/university）
She always did well at school. (她在學校表現一直很好。)
5、用在具體地址、某人家裡前（to refer to an address or someone"s house)
They once lived at number 12 South George’s Street. (他們曾經住在南喬治街12號。)
6、用在公共服務場所（to talk about public places where we get treatments, such as a hairdresser’s or doctor’s surgery）
I can’t meet at four. I’ll be at the hairdresser’s until five. (四點我無法跟你碰面。我在美髮店要呆到五點。)
7、用在大部分商店前（to refer to most shops）
Look what I bought at the butcher’s today. (看看我今天在肉店都買了些什麼。)
8、用在旅途中經過的地點前（to refer to a place which is a part of our journey）
We stopped at a very nice village. (我們途經一個很漂亮的村莊。)
9、用在不含day的節假日前（to refer to a holiday without “day” in its name）
People will always enjoy a big dinner at Christmas. (人們在聖誕節總會享用一頓大餐。)
二、on
1、用在任何物體或地點的表面前（to refer to a position on any surface）
I know I left my wallet on the table. (我知道我把錢包落在桌子上了。)
2、用在道路和河海湖前（to describe a position along a road or river or by the sea or by a lake）
Dublin is on the east coast of Ireland. (都柏林位於愛爾蘭的東部海岸。)
3、用在建築物的樓層前（to talk about a floor in a building）
They live on the 15th floor. (他們住在15樓。)
4、用在公共交通工具前（to talk about being physically on public transport）
I was on the train when she phoned. (她給我打電話時，我在火車上。)
注意：當我們描述旅遊時選擇的交通工具時，一般用by，如：He went to Paris by air. (他坐飛機去了巴黎。) 但是，如果要表達走路，則用on foot。
5、用在小島前（with small islands）
She spent her holiday on a small island. (她在一個小島上度的假。)
三、in
1、用在某個地方的內部前（to talk about locations within a larger area）
I know my book is somewhere in this room. Can anyone see it? (我知道我的書就在這個房間的什麼地方。有誰看到嗎？)
2、用在物理意義上的工作地點前（to talk about workplaces when we see them as a physical location）
She works in an open-plan office. (她在一個開敞式的辦公室裡工作。)
注意：當表示農場（farm）時，一般用on，如：I"ve always wanted to work on a farm. (我一直想在農場裡工作。)
3、用在class前（with class）
He found it difficult to concentrate inclass. (他覺得很難在課上集中注意力。)
4、用在國家、城市、縣鎮或其他地域前（with countries, cities, counties, towns or places as such)
They live in New York. (他們住在紐約。)
一、at
1、用在表示地域面積不大的某個點的地方（如飯桌旁、電影院、車站、機場等）前（to refer to a position or location which we see as a point）
I was sitting at my desk. (當時我正坐在課桌旁。)
2、用在公司名稱（側重表達的是工作的單位，而不是工作地點）前（to talk about locations at companies, workplaces when we see them as a place of activity）
How many people are working atMicrosoft? (有多人在微軟工作？)
3、用在很多人參與的活動場合前（to refer to activities which involve a group of people）
Were you at Lisa’s party/the cinema/the theatre? (你當時在麗莎的聚會上/電影院裡/劇院裡嗎？)
4、用在學校前（with school/college/university）
She always did well at school. (她在學校表現一直很好。)
5、用在具體地址、某人家裡前（to refer to an address or someone"s house)
They once lived at number 12 South George’s Street. (他們曾經住在南喬治街12號。)
6、用在公共服務場所（to talk about public places where we get treatments, such as a hairdresser’s or doctor’s surgery）
I can’t meet at four. I’ll be at the hairdresser’s until five. (四點我無法跟你碰面。我在美髮店要呆到五點。)
7、用在大部分商店前（to refer to most shops）
Look what I bought at the butcher’s today. (看看我今天在肉店都買了些什麼。)
8、用在旅途中經過的地點前（to refer to a place which is a part of our journey）
We stopped at a very nice village. (我們途經一個很漂亮的村莊。)
9、用在不含day的節假日前（to refer to a holiday without “day” in its name）
People will always enjoy a big dinner at Christmas. (人們在聖誕節總會享用一頓大餐。)
二、on
1、用在任何物體或地點的表面前（to refer to a position on any surface）
I know I left my wallet on the table. (我知道我把錢包落在桌子上了。)
2、用在道路和河海湖前（to describe a position along a road or river or by the sea or by a lake）
Dublin is on the east coast of Ireland. (都柏林位於愛爾蘭的東部海岸。)
3、用在建築物的樓層前（to talk about a floor in a building）
They live on the 15th floor. (他們住在15樓。)
4、用在公共交通工具前（to talk about being physically on public transport）
I was on the train when she phoned. (她給我打電話時，我在火車上。)
注意：當我們描述旅遊時選擇的交通工具時，一般用by，如：He went to Paris by air. (他坐飛機去了巴黎。) 但是，如果要表達走路，則用on foot。
5、用在小島前（with small islands）
She spent her holiday on a small island. (她在一個小島上度的假。)
三、in
1、用在某個地方的內部前（to talk about locations within a larger area）
I know my book is somewhere in this room. Can anyone see it? (我知道我的書就在這個房間的什麼地方。有誰看到嗎？)
2、用在物理意義上的工作地點前（to talk about workplaces when we see them as a physical location）
She works in an open-plan office. (她在一個開敞式的辦公室裡工作。)
注意：當表示農場（farm）時，一般用on，如：I"ve always wanted to work on a farm. (我一直想在農場裡工作。)
3、用在class前（with class）
He found it difficult to concentrate inclass. (他覺得很難在課上集中注意力。)
4、用在國家、城市、縣鎮或其他地域前（with countries, cities, counties, towns or places as such)
They live in New York. (他們住在紐約。)