lz啊 on的用法其实很简单 我下面列举了出来 你说的两种语法 其中第二种很常见 可以与upon互换
例如 一。。。就。。。。
例如：On/upon arriving at the airport,we all were welcomed warmly
一到飞机场，我们所有人受到热烈欢迎
下面是on的用法
一. 作介词：
1. 表示位置：在……上
Lucy’s coat is on the desk .
We’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 .
二. 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
嘿嘿 希望对你有所帮助 祝楼主进步哈
追问太长了太长了太长了，看得好烦。。
那么有on+一段时间的用法的吗，谢谢
追答至少我知道的 木有。。。。。。。。。。
追问好吧好吧，可能是我记错了，但是哪个介词后面能跟一段时间，然后就句子就要用将来式的呢
追答in可以
in加一段时间
表示将来的一段时间持续 用 in，如：He'll come back in 2 days. 他两天后回来。
呵呵 希望对你有所帮助