介词是用来表示物体、人和地点之间相互关系的词语。介词in，on和at常被用来表示这些关系。这里有关于何时该用介词的解释，并附有例句来帮助你理解。
1.In
a.In用于室内或室外的场所。
in a room / in a building
在房间/大楼里
in a garden / in a park
在花园/公园里
I have two TVs in my house.
我房子里有两个电视。
They live in that building over there.
他们住在那栋楼里。
b.in与水域进行搭配
in the water
在水里
in the sea
在海里
in a river
在河里
I like swimming in lakes when the weather is hot.
我喜欢天气热时在湖里游泳。
You can catch fish in the river.
你可以在湖里捉鱼。
c.in和行、队伍等进行搭配
in a row / in a line
一行
in a queue
一队
Let’s stand in line and get a ticket to the concert.
站成一行，买票去听音乐会。
We had to wait in a queue to get into the bank.
我们只得站成一队等着进入公园。
d. in与城市、县、州、地区和国家搭配
Peter lives in Chicago.
皮特住在芝加哥。
Helen is in France this month. Next month she’ll be in Germany.
海伦这个月在法国。下个月她就在德国了。
2.At
a.at与具体的地点进行搭配
at the bus-stop
在公交车站
at the door
在门边
at the cinema
在电影院
at the end of the street
在街的尽头
I’ll meet you at the movie theater at six o’clock.
我六点在电影院见你。
He lives in the house at the end of the street.
他住在街尾那间房子里。
b. at与页面位置进行搭配
The name of the chapter is at the top of the page.
本章名字在书页上端。
The page number can be found at the bottom of the page.
书页底部可以看到页码。
c. at与一群人进行搭配
at the back of the class
在教室后排
at the front of the class
在教室前排
Tim sits at the back of the class.
蒂姆坐在教室后排。
Please come and sit down at the front of the class.
请过来，坐在教室前排。
3.On
a.on与物体表面进行搭配
on the ceiling / on the wall / on the floor
天花板/墙/地板上
on the table
桌子上
I put the magazine on the table.
我把杂志放在桌子上。
That’s a beautiful painting on the wall.
墙上的画很漂亮。
b. on与小岛进行搭配
I stayed on Maui last year. It was great!
去年我去了毛伊岛。那儿真是太棒了!
We visited friends who live on an island in the Bahamas.
我们拜访了住在巴哈马群岛的朋友们。
c. on与方向进行搭配
on the left
左边
on the right
右边
straight on
往前直走
Take the first street on the left and continue to the end of the road.
在第一条街左转，然后继续走到路的尽头。
Drive straight on until you come to a gate.
一直往前开，知道看见一扇门。
重要建议
1.In / at / on the corner
在角落
我们会说in the corner of a room，at the corner (或on the corner)of a street。
I put the chair in the corner of the bedroom of the house on the corner of 52nd Street.
我把椅子放在52号街房子的卧室角落处。
I live at the corner of 2nd Avenue.
我住在二号大街的拐角处。
2.In / at / on the front
在前面
我们会说in the front / in the back of a car(车子前方/后方)
I get to sit in the front Dad!
我要坐在爸爸前面!
You can lay down and sleep in the back of the car.
你可以躺下来，在车后面睡一下。
我们会说at the front / at the back of buildings / groups of people(在建筑物/一群人前面/后面)
The entrance door is at the front of the building.
入口在建筑物前方。
我们会说on the front / on the back of a piece of paper(纸张正面/背面)
Write your name on the front of the paper.
把你的名字写在纸张正面。
You’ll find the grade on the back of the page.
你会在纸张背面看到分数。
4.Into
使用into来表示从一个地方到另一个地方的移动。
I drove into the garage and parked the car.
我把车开进车库，并停好。
Peter walked into the living room and turned on the TV.
皮特走进卧室，打开电视。
5.Onto
使用onto来表示某人将某物放在物体表面。
He put the magazines onto the table.
他把杂志放在桌子上。
Alice put the plates onto the shelf in the cupboard.
爱丽丝把碗放在碗柜的架子上。
6.Out of
当表示将某物拉出来或者离开房间时，可以使用out of。
I took the clothes out of the washer.
我把衣服从洗衣机里拿出来。
He drove out of the garage.
他把车从车库开出来。
练习题
做练习，检测自己的掌握水平。然后核对下面的答案。
1. My friend now lives _____ Arizona.
(我的朋友住在亚利桑那州。)
2. Go down the street and take the first street _____ the right.
(沿着这条街走，在第一条街向右转。)
3. That’s a beautiful pictures _____ the wall.
(墙上的画很漂亮。)
4. My friend lives _____ the island of Sardinia.
(我朋友住在撒丁区的一个岛上。)
5. He’s the man _____ the front the room.
(他就是站在房间前面的那个人。)
6. He drove the car _____ the garage.
(他把车开进车库。)
7. I’ll meet you _____ the shopping mall.
(我在购物中心见你。)
8. I like to sit _____ the back of the room.
(我想坐在房间后排。)
9. Tom went swimming _____ the lake.
(汤姆在湖里游泳。)
10. Let’s stand _____ the line to see the movie.
(站成一排去看电影。)
答案
1. in
2. on
3. on
4. on
5. at
6. into / out of
7. at
8. in
9. in
10. in
