Prepositions like in, on, and at indicate position or location. At is used to indicate a specific place like an address, location, or time. On is used to indicate being on the surface of something or direction. In is used to indicate being inside a room, place, weather condition, type of transport, or name of country/city/street. These prepositions are also used to talk about time, with at used for specific times, on used for days/dates, and in used for parts of days/months/seasons/years.

1. Prepositions [!] In On At
[!]
Estas preposiciones indican posición
AT
IN
|(Dentro) ON
( Sobre) .
AT the + place
the cinema, theatre, school
specific place HeathrowAirport,
Buckingham Palace
specific address including at 33 rue de La Fayette,
the house number/name Paris
ON a/the + surface of a place shelf, wall, floor, ceiling
or object
the + directions left/right/other
side/nearside
a/the + types of transport horse, bicycle, train, foot
levels of a building: first floor, second floor, top
floor
IN the + rooms and places kitchen, bedroom,
auditorium

2. the + weather sun, rain, hail, snow
a/the + types of transport car, train, van, lorry,
aeroplane, ship
names of countries, names France, England, Poland,
of towns, villages, cities, Warsaw, London,
streets. Moniuszki, Fish Street.
Tambien sirven para hablar de tiempo.
AT particular time dawn, midday, noon,
night, midnight, nine
o'clock
calendar festival season Christmas, New Year,
Easter
meal breakfast, lunch, mid-
morning, tea, dinner
ON day of theweek Monday, Tuesday,
Wednesday
particular date 25 July 2001, 4 January
calendar festival day Christmas Day, Palm
Sunday.
particular part of a day Friday morning, Saturday
afternoon.
IN the + a part of a day the morning, the
afternoon,
month January, February, March,
April, May
season of the year Spring, Summer, Autumn
specific year 1988, 1989, 1990