on基本意义“在之上”接触面,“靠近、接壤、左右边”;

in基本意义“在里面”和“中间”;

at基本意义表示小地点, “入口、车站、电影院”;

home出现定语、冠, 须用in把at换;

“夜间、车辆”若有限, 及“在途中”on在前。

知识拓展:

①在表示地点时,指“在……之上(与表面接触)” “靠近、接壤”及“在左右边”都用on。

例 There is an English-Chinese dictionary and two grammar books on the big desk.那张大写字台上有一本英汉词典和两本语法书。

Korea lies on the northeast of China. 朝鲜位于中国东北方。

Tom was sitting on my left when we saw the film yesterday. 我们昨天看电影时,汤姆坐在我左边。

表示在……的东部、西部、南部、北部(不接囊)用to

②表示“在……里面”(即物体内部),“在……中间”(即middle前)都用in。

例 Jim turned the key in the lock and opened the door. 吉姆把钥匙插在锁孔里,转动一下,打开了门。

Soon they were in the middle of the river. 很快他们就游到了河中间。

in a car 乘汽车

in a taxi 乘的士

in a helicopter 乘直升机

in a boat 乘小船

in a lift (elevator) 乘电梯 (电梯像个笼子,当然要用 in 啦)

in the newspaper 在报上

in the sky 在空中

in the bed 在床上 (也可用 on the bed)

in the bedroom/ class/ library/ school 在寝室/课室/图书馆/学校

in the tree不属于树上长的东西用in

on the tree属于树上长的东西用on

③ at表示一个较小的地点,如在“入口”(entrance)“车站”(bus stop,railway station)和“影剧院”(cinema,theater)等名词前。

例 As she walked along,she noticed an old pine tree ahead at the entrance to a valley. 她往前走时,注意到前边峡谷口有棵老松树。

at reception 在招待会上

at class/ home/ the library/ the office/ school 在班上/家里/图书馆/公

司/学校

之意体会下面几个例子,很有意思:

1. I live in London. 我住在伦敦。(大城市用in)

2. I live in England, at London. 我住在英国伦敦。(England大过London喔)

3. I live in a big city, my sister lives at a small town. 我住在大城市,我

姐姐住在一个小市镇。(如果把city看做一个圆圈,small town就成一个点。因此就in

a city, at a small town. 呵呵)

④home前一般用at,但若有物主代词和冠词等定语修饰时,须用in。

例 In Princeton he lived quietly,working at the institute and enjoying himself by playing his violin in his simple home. 他在普林斯顿过着安静的生活,在研究所工作,在他那简朴的家里拉琴消遣。

⑤“夜间”(night)、“车辆”(bus,bike,train ect.)等名词若有限定词及“在……途中”,介词则用on。

例 He was in on that night. 他那天夜里在家。

My son often goes to school on his bike.我儿子常骑自行车去上学。

On the way home my father told me of an incident that took place on his first day at school in Mr Crossett's class. 在回家途中,父亲给我讲了他第一天上克罗塞特先生课时发生的一件事。

on the ceiling 在天花板上

on the floor 在地板上

on a bus 乘巴士 (不是 in a bus 喔)

.on a train 乘火车 (可想像“骑”在火车上,哈哈)

on a plane 乘飞机 (可想像“骑”在飞机上)

on a ship 乘轮船

on a bicycle, on a motorbike 骑自行车/摩托车

I live on the 7th floor at 21 Oxford Street in London. 我住在伦敦牛津街

21号八楼。(7th floor 就是八楼;注意句中的 on, at, in 的用法)

on a horse, on an elephant 骑马/象

on the radio, on television 听广播、看电视

on the left, on the right 在左边、在右边

on the way 在路上

in the way 挡道,阻碍,妨碍

on,in,at表示地点用法解析