what加表地点的介词短语用therebe举行回答特别需要注意的是再问什么时候 被动词只用is 请举

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They have been away on a long trip. 他们出去做一次长途旅行.
I'll go home on leave next month. 下月我将休假回家.
I went on business to Shanghai. I did not take leave. 我是公出去上海的,不是不告面别.
She came to see you on purpose. 她是专程来看你的.
He came here on purpose to discuss it with you. 他到这来是要与你讨论这件事的.
This lunch is on me.
No. let's go Dutch.
这顿午饭我付钱.
不,还是各付各的.
On the contrary, it was very easy to understand. 相反,这事儿很容易理解.
P1ease e on time. (on schedule). 请准时来.
注：in time是及时的意思.
The train arrived on schedule. 火车准时到达.
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carrige.
at山脚、门口在当前,速、温、日落价核心
即在山脚下、在门口、在目前,速度、以……速率、温度、在日落时、在……核心要用at.
例：At the foot of the mountain, there are thirty of our rades. 在山脚下,有我们30个同志.
There is a beautiful lake at the foot of the hill. 山脚下有一个美丽的湖.
At the gate of the house there are many children playing glassball. 门口有一大群孩子在玩玻璃球.
Who's standing there at the door? 谁站在门口?
I don't need the dictionary at present. 我现在还不需要这本词典.
He is at present in Washington. 他目前正在华盛顿.
The train runs at fifty kilometres an hour. 火车每小时行驶50公里.
we built the plant at top speed and minimun cost. 我们以最低的投资,最高的速度修建了该工厂.
at home 在国内,在家里
at ten degrees centigrade 在摄氏10度 at minus ten degrees centi