prep.在 ... 之上；由 ... 支撑着；在（某一天）；关于；基于

adv.穿着；向前（移动)；表示持续性

adj.表示已连接、处于工作状态或使用中；发生；值班

The spider is walking on the ceiling. 蜘蛛在天花板上爬行。

I bought it on credit. 这东西我是赊购来的。

He studied at Oxford on a Rhodes scholarship. 他靠罗兹奖学金在牛津就读。

What do you do on New Year's Day? 元旦你做什么？

He will give a lecture on international affairs. 他会作关于国际形势的讲座。

They made their own judgment on his report. 他们凭他的报告作出自己的判断。

Put your coat on. 穿上你的大衣.

Why hasn't she got her glasses on? 她怎么没戴眼镜呢？

Move on! 向前走！

Time marches on. 时光流逝。

She worked quietly all night. 她整个晚上默默地继续工作。

He walks on down the corridor. 他沿着走廊一路走过去。

The televisionw set was on. 电视机开着。

The light were all full on. 灯火通明。

The war was on then. 那时正在打仗。

There was a scare on about cancer. 当时正出现恐癌症。

The night nurse is/goes on at 7pm. 晚班护士7点钟上班。

日期前的on常被省略。 The People's Republic of China was established (on) 1 October, 1949.

注意in与on的使用：on表示“在物体的表面上”，而in表示“在其中”。指能用in的表达方式有in the morning，in the afternoon，in the evening和in the night。只能用on的表达方式有on the next morning，on the following afternoon，on the preceding evening，on the night before，on the morning of 6 January等。英美两国人在用in与on的习惯上不同。表示“在报上，地图上”等时，介词用in，而不用on。表示“手，脚受伤”时，应用介词in，而表示“手脚上的斑点”时，应用介词on； He lives on the next street.（美国用法）He lives in the next street.（英国用法）

on the river在不同意境下，意思不同。 He lives in a house on the river.他住在河边上。 He sails on the river every Sunday.他每天在河上航行。