星期三我没有时间。
1.I don't have time on Wednesday.
2.I have no time on Wednesday.
3.I'm not free on Wednesdays.
4.I am not available on Wednesday.
on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 .
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