The workers of the railway station were on strike. 鐵路工人罷工了。

　　Grapes and big water melons from Sinkiang are on sale on a large sale.新疆葡萄和西瓜大量上市了。

　　Do something on the sly (quiet). 秘密地(暗地里，偷偷地)做某事。

　　I've come here on business. 我是有公事來的。

　　They went to Bern on a mission. 他們到伯爾尼去執行一項使命。

　　They have been away on a long trip. 他們出去做一次長途旅行。

　　I'll go home on leave next month. 下月我將休假回家。

　　I went on business to Shanghai. I did not take leave. 我是公出去上海的，不是不告而別。

　　She came to see you on purpose. 她是專程來看你的。

　　He came here on purpose to discuss it with you. 他到這來是要與你討論這件事的。

　　“This lunch is on me.”“這頓午飯我付錢。”

　　“No. let's go Dutch.”“不，還是各付各的。”

　　On the contrary, it was very easy to understand. 相反，這事兒很容易理解。

　　P1ease come on time. (on schedule). 請準時來。

　　注：in time 是“及時”的意思。

　　The train arrived on schedule. 火車準時到達。

　　特定時間和“一……就”，左右 on 后動名詞

　　例：Gases expand on heating and contract on cooling. 氣體加熱時膨脹，冷卻時收縮。(特定時間)

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

　　一進屋，他就發現他的朋友們在愉快地跳舞。

　　On reaching the city he called up Lao Yang. 一到城里他就給老楊打了一個電話。

　　I'll write to him on hearing from you. 我接到你的來信就給他寫信。(一……就)

　　以及 on the left, right 向左向右，on the stair 在臺階上等

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