1. On vacation 등
(be/go) on vacation / on business / on a trip / on a tour / on a cruise 등:
Tom's away at the moment. He's on vacation in France. (not in vacation)
One day I'd like to go on a world tour.
"go to a place for a vacation / for my vacation / for vacation":
Tom has gone to France for a vacation. (or for vacation)
Where are you going for your vacation next summer?
2. on을 사용하는 다른 표현
on television / on the radio:
I didn't watch the news on television, but I heard it on the radio.
on the phone/telephone:
I've never met her, but I've spoken to her on the phone.
(be/go) on strike / on a diat:
There are no trains today. The railroad workers are on strike.
I've put on a lot of weight. I'll have to go on a diat.
(be) on fire:
Look! That car is on fire.
on the whole (일반적인 경우):
Sometimes I have problems at work, but on the whole I enjoy my job.
on purpose (의도적인 경우):
I'm sorry. I didn't mean to annoy you. I didn't do it on purpose.
3. in을 사용하는 다른 표현
in the rain / in the sun (= sunshine) / in the shade / in the dark / in bad weather 등:
We sat in the shade. It was too her to sit in the sun.
Don't go out in the rain. Wait until it stops.
(write) in ink / in pen / in pencil:
When you take the exam, you're not allowed to write in pencil.
in words, in numbers, in capital letters 등:
Please fill out the form in capital letters.
(pay) in cash:
I paid the bill in cash. but I paid by check / by credit card. (see unit 124)
(be/fall) in love (with somebody):
Have you ever been in love with anybody?
in my opinion (or your/his/her 등):
In my opinion, the movie wasn't very good.
4. At the age of ... 등:
at the age of ... / at a speed of ... / at a temperature of ... 등:
Jill graduated from school at 17. or ... at the age of 17.
The train was traveling at 120 miles an hour. or ... at a speed of 120 miles an hour.
Water boils at 212 degrees Fahrenheit. or ... at a temperature of 212 degrees Fahrenheit.