一、表示地理位置的介词：(1)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
例句： 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。
例句：The bird is flying above my hea
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
例句：There is a cat under the table.
Please write your name below the line.