介词 on 的常见
on + 名词构成的词组
on board乘（车，飞机）onduty；
on call 听候召唤；
on duty 值班；
on earth 到底；
on fire 着火；
on foot 步行；
on guard 在岗；
on hire 雇用；
【on holiday 度假，在休假中， 在度假】
例句
When I was on holiday, I visited my uncle.
我在度假的时候去看望了叔叔。
I do not like to travel during the holiday season.
我不喜欢在度假的季节去旅游。
If you save some money each week, we can go on holiday.
要是你每星期能存点儿钱，咱们就可以外出度假了。
We’re going on holiday soon, probably next month.
我们很快就要去度假了，多半是下个月。
We put the dog into a kennel when we go on holiday.
我们去度假时把狗送到养狗场寄养。
Burglars had broken in while we were away on holiday.
我们外出度假时，小偷闯入屋内行窃。
I always get up with the lark when I’m on holiday to make the most of every single day.
在度假时，为了充分享受每一天，我每天总是起得很早。
I got through$200 on holiday.
节日里我化了200美元。
The director is on holiday.
这位董事正在度假。
She’s on holiday; she needed a change from work.
她正在度假，她需要放下工作改变一下生活。