on后接the加上一個作名詞的動詞．其意義與現(xiàn)在分詞所表達的相近。類似例子很多如：
on the march在行軍中，on the mend 在好轉中，on the prowl徘徊，on the move活動中，on the scrounge巧取豪奪(埋語)，on the go活躍，忙碌，on the lookout注意, 警戒，on the watch監(jiān)視著。on the hop趁不備抓住某人等等。
on the People's Democratic Dictatorship<<實踐論>>和<<矛盾論>>
on the People's Democratic Dictatorship<<論人民民主專政>>
"on Coalition Government" <<論聯(lián)合政府>>
著、罷、出售、偷、公、假，故意、支付，相反、準
注：口訣中的"著"是指著火，罷指罷工，偷指偷偷地，公指出差、辦公事；假指休假，準指準時。
例：The house next to mine was on fire. 我鄰居的房子著火了。
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(zhí)行一項使命。
They has 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，不是不告面別。
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.
"No. let's go Dutch."
"這頓午飯我付錢。"
"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(fā)現(xiàn)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)
