介词是一种用来表示词与词,词与句之间的关系的词.在句中不能单独作句字成分.介词后面一般有名词代词或相当于名词的其他词类,短语或从句作它的宾语.介词和它的宾语构成介词词组,在句中作状语,表语,补语或介词宾语.at ,in,on,to
at (1)表示在小地方; (2)表示“在……附近,旁边”
in (1)表示 在大地方; (2)表示“在…范围之内”.
on 表示毗邻,接壤
to 表示在……范围外,不强调是否接壤
He arrived at the station at ten.
He is sitting at the desk.
He arrived in Shanghai yesterday.
Jiangsu lies in the east of China.
Russia lies on the north of China.
Fujian is to the south of Jiangsu Province.
2)above,over,on 在……上
above 指在……上方,不强调是否垂直,与 below相对；
over指垂直的上方,与under相对,但over与物体有一定的空间,不直接接触.
on表示某物体上面并与之接触.
The bird is flying above my head.
There is a bridge over the river.
He put his watch on the desk.
3)below,under 在……下面
under表示在…正下方
below表示在……下,不一定在正下方
There is a cat under the table.
Please write your name below the line.
