特定时间和“一……就”，左右on 后动名词

例：Gases expand on heating and contract on cooling. 气体加热时膨胀，冷却时收缩。(特定时间)

On entering the room, he found his friends dancing in high spirits.

一进屋，他就发现他的朋友们在愉快地跳舞。

On reaching the city he called up Lao Yang. 一到城里他就给老杨打了一个电话。

I'll write to him on hearing from you. 我接到你的来信就给他写信。(一……就)

以及on the left, right 向左向右，on the stair 在台阶上等。

步行、驴、马、玩笑on，cab，carriage 用in

例：On foot 步行; on horse 骑马; on donkey 骑驴。

He rode on, blood flowing from his side. 他骑着马，鲜血从腰部流下来。

The soldier of the Eighth Route Army rode 100 li on a horse a day in order to catch up with his unit. 为赶上部队，那位八路军战士骑马日行百里。

Go on horse back! 骑马去!

You are having me on! 你和我开玩笑呢!

in cab 和in carriage 不能用on 或by cab 或carriage。

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