我想问一下On 的用法 在什么情况下是什么意思 谢谢
你好，同学，才看到你发来的求助题。虽然已经有人回答，但是他的答案太罗嗦了，一点也不清晰。
1. at指时间表示：
（1）时间的一点、时刻等。如：
They came home at sunrise （at noon, at midnight, at ten o’clock, at daybreak, at dawn）.
（2）较短暂的一段时间。可指某个节日或被认为是一年中标志大事的日子。如：
He went home at Christmas （at New Year, at the Spring Festival, at night）.
2. in指时间表示：
（1）在某个较长的时间（如世纪、朝代、年、月、季节以及泛指的上午、下午或傍晚等）内。如：
in 2004, in March, in spring, in the morning, in the evening, etc
（2）在一段时间之后。一般情况下，用于将来时，谓语动词为瞬间动词，意为“在……以后”。如：
He will arrive in two hours.
谓语动词为延续性动词时，in意为“在……以内”。如：
These products will be produced in a month.
注意：after用于将来时间也指一段时间之后，但其后的时间是“一点”，而不是“一段”。如：
He will arrive after two o’clock.
3. on指时间表示：
（1）具体的时日和一个特定的时间，如某日、某节日、星期几等。如：
On Christmas Day（On May 4th）, there will be a celebration.
（2）在某个特定的早晨、下午或晚上。如：
He arrived at 10 o’clock on the night of the 5th.
（3）准时，按时。如：
If the train should be on time, I should reach home before dark.
at (on) the weekend （在周末——特指）
at (on) weekends （在周末——泛指）
over the weekend （在整个周末）
during the weekend （在周末期间）。
在圣诞节，应说"at Christmas", 而不说"on Christmas"。
希望能帮到你，祝更上一层楼O(∩_∩)O
有不明白的请继续追问(*^__^*)
on
介词 prep.
1.在...上
He laid a hand on my shoulder.
他把一只手放在我肩上。
2.以...支持,挂在...上;以...为轴
There is a picture on the wall.
墙上有一幅画。
3.朝,向
4.靠近,在...旁,沿着
She stood on my left.
她站在我左边。
5.在...的时候,在...后立即
He jumped with joy on hearing the news.
他一听到这个消息就高兴得跳了起来。
6.关于,有关
The teacher made comments on our compositions.
老师就我们的作文作了讲评。
7.以...方式,通过
Did you hear it on the radio?
你是从收音机听到这消息的吗?
8.凭...,靠...;使用...,吃...
They said they were acting on instructions.
他们说他们是奉命行事。
9.处于...状态,进行中
10.属于...,参加...,是...的成员
He is on the school volleyball team.
他是校排球队队员。
11.加之于,重叠于
12.由...支付
Have another coffee on me.
再来一杯咖啡,我请客。
13.带在...身上
副词 ad.
1.继续
They talked on until midnight.
他们一直谈到深夜。
2.向前
3.穿上,盖上,连接上
It's cold today. Why don't you put your overcoat on?
今天很冷。为什么不把大衣穿上?
4.(机器)处于工作状态;开着;通着
He left the engine on while waiting for Joe.
他在等候乔时让汽车引擎开着。
5.上演着;在进行中
形容词 a. [Z]
1.(机器等)工作着的,开着的
2.正在上演的,在放映的
What's on for tonight at the cinema?
今晚电影院上映什么片子?
3.在发生的,在进行的
The strike is still on.
现在仍在罢工。
4.菜单上有的,供应的
I'd like to have some salmon if it is on.
如果有大马哈鱼供应,我想来一点。
5.【俚】知情的
6.【美】【俚】醉了的
ON
缩写词 abbr.
1.=Old Norse古挪威语
2.=Ontario
on.
缩写词 abbr.
1.=octane number【化】辛烷值,奥克炭数,辛烷数
2 说不好 大概嘛 也是关于什么的意思
关于On的用法：
(1) 作介词：
1. 表示位置：在……上
Mary’s coat is on the desk .
They’re going to work on a farm .
There are many apples on the trees .
I have them on this piece of paper .
There was a big smile on her face .
Jim and Li Lei meet on the road outside Li Lei’s house .
Which channel is it on ?
2. 表示时间：在……（天）
Everyone eats mooncakes on Mid-Autumn Day .
They arrived early on a Tuesday morning .
I eat mooncakes on that day .
I was born on February 18 , 1981 .
Either Tuesday or Wednesday is OK . I’ll be free on these days .
3. 关于……
In the library she has got books on many different subjects .
(2) 作副词，与动词连用，构成短语：
1. come on跟我来，加油
“Come on !”they shouted .
2. get on上（车）
Let’s get on the bus .
3. get on with（sb. ）与（某人相处）
Usually we get on very well with each other .
4. go on继续
Autumn starts in August , and goes on to October .
Go on until you reach the end .
5. hold on（for a moment）别挂断电话，等一等
A : Hello ! Could I speak to the headmaster , please ?
B : Hold on for a moment , please . I’m sorry , he isn’t here right
now . May I help you ?
6. put on穿上，戴上，上演
Put it on , please Lily .
Don’t be late——oh , and put on your old clothes .
7. try on试穿（衣服），试试看
Shall I ask the shopkeeper if I can try it on ?
8. turn on开，旋开（电灯，无线电等）
I turned on the radio .
Turn it on .
9. pass on传递
They both passed on their sticks at the same time .
10. go on with（sth. ）继续做……
They went on with their work .
11. walk on继续走
Walk on and turn left .
(3) A. 作介词，与动词连用，构成短语：
1. go on继续
He quickly got up and went on running .
2. spend … on在……花费
I like writing to my penfriend , but I can’t spend much time on it .
3. keep on继续
I kept on thinking about the match in the afternoon .
4. knock on敲
The boy is knocking on the door .
5. work on致力于
He works on the Great Green Wall with many other people .
Please tell Mr. Hu that I am working hard on my Chinese .
6. live on靠……为生
They lived on potatoes .
7. call on访问，拜访
I called on you .
B. 作介词，与名词连用，构成短语：
1. on foot走路，步行
I see you’re on foot today .
2. on the / one’s way to在途中，在路上
On her way home she bought a new pen at a shop .
3. on time 准时；不早不晚
You must always return your library book on time.
4. on duty值日
Who’s on duty today .
5. on show展览；陈列
They saw many old things on show in glass-topped tables .
6. on（the）earth在地球上
Two thousand years ago , there were only 250 million people on the
earth .
7. on the left/ right在左（右）边
Walk along this road and take the fourth turning on left .
8. on the radio通过收音机，以无线电的方式
She said that she heard a very interesting programme on the radio .
9. on TV通过电视，以电视的形式
We can watch a football match on TV .
10. on top of在……上面（顶部）
Can you see much grass on top of the rock ?
11. on the team在队里
Neither of them is on the team .
12. on a visit在访问
Xia Yi is on a visit to England .
13. on fire着火
The building is on fire .
14. on holiday休假，度假
You and your family are away on holiday .
15. on sale出售
The meat is on sale in the market.
(4) 其他
1. and so on等等
There are different kinds of vegetables in the shop , such as
tomatoes , potatoes , carrots , peas , cabbages and so on .
2. on and on继续，不断
They talked on and on very happily .
3. from now on从此以后，今后
Please be more careful from now on .
4. later on过后，以后
The radio says the rain will stop later on
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