Угтвар үг
Угтвар үг нь юмс ба үзэгдлийн хоорондох холбоог илэрхийлдэг.
Prepositions of Time: at, in, on
We use:
at - тодорхой нарийн цагт
in - сар, жил, зуун ба урт хугацаанд
on - өдөр болон товлосон өдөр, цаг хугацаанд

at
in
on
PRECISE TIME
MONTHS, YEARS, CENTURIES and LONG PERIODS
DAYS and DATES
at 3 o'clock
in May
on Sunday
at 10.30am
in summer
on Tuesdays
at noon
in the summer
on 6 March
at dinnertime
in 1990
on 25 Dec. 2010
at bedtime
in the 1990s
on Christmas Day
at sunrise
in the next century
on Independence Day
at sunset
in the Ice Age
on my birthday
at the moment
in the past/future
on New Year's Eve

I have a meeting at 9am.
The shop closes at midnight.
Jane went home at lunchtime.
In England, it often snows in December.
Do you think we will go to Jupiter in the future?
There should be a lot of progress in the next century.
Do you work on Mondays?
Her birthday is on 20 November.
Where will you be on New Year's Day?

When we say last, next, every, this we do not also use at, in, on.
I went to London last June. (not in last June)
He's coming back next Tuesday. (not on next Tuesday)
I go home every Easter. (not at every Easter)
We'll call you this evening. (not in this evening)

Prepositions of Place: at, in, on
In general, we use:
at -ийг байр, газарт
in - хашигдсан орон зайд
on - гадна талд,гадаргад

at
in
on
POINT
ENCLOSED SPACE
SURFACE
at the corner
in the garden
on the wall
at the bus stop
in London
on the ceiling
at the door
in France
on the door
at the top of the page
in a box
on the cover
at the end of the road
in my pocket
on the floor
at the entrance
in my wallet
on the carpet
at the crossroads
in a building
on the menu
at the entrance
in a car
on a page

Look at these examples:
Jane is waiting for you at the bus stop.
The shop is at the end of the street.
My plane stopped at Dubai and Hanoi and arrived in Bangkok two hours late.
When will you arrive at the office?
Do you work in an office?
I have a meeting in New York.
Do you live in Japan?
Jupiter is in the Solar System.
The author's name is on the cover of the book.
There are no prices on this menu.
You are standing on my foot.
There was a "no smoking" sign on the wall.
I live on the 7th floor at 21 Oxford Street in London.