This document discusses the use of prepositions of place (at, in, on) and time (at, in, on). For place, we use "at" for addresses, "in" for enclosed spaces and streets/cities, and "on" for surfaces. For time, we use "at" for specific times, "on" for days/dates, and "in" for longer periods like months/years. There are also some exceptions noted such as using "in" for hospitals but "at" home or work.

1. PREPOSITIONS OF PLACE (AT, IN, ON)
• AT, IN, and ON are the most common prepositions of place.
1. We use IN with streets, cities, districts, regions and countries:
She lives in Roland Street / in Oxford / in England.
They live in the south of France.
We use AT with addresses:
I live at 47, George Street.
2. We use IN with rooms: in the kitchen
We use IN with other enclosed places: in an envelope / in my pocket
We use ON with surfaces: on the floor / on the ceiling / on the pavement
We use ON with FLOOR when we talk about part of a building:
My flat is on the third floor.

2. 3. We use at home, at work, at school, at university to talk about
being in the place where we live, work, or study:
I was at work / at home yesterday.
But we say in hospital, in prison, etc. to talk about being a patient
or prisoner in the place:
Jack is very ill and he’s in hospital.

3. PREPOSITIONS OF TIME (AT, IN, ON)
• We use:
AT for the time of day:
at five o’clock / at 11.45 / at midnight / at lunchtime / at sunset etc.
ON for days and dates:
on Friday(s) / on 16 May 1999 / on Christmas Day / on my birthday
IN for longer periods (e.g. months/years/seasons):
in October / in 1988 / in the 18th
century / in the past
in (the) winter / in the 1990s / in the Middle Ages / in (the) future

4. • We use AT in these expressions:
at night
at the weekend / at weekends
at Christmas
at the moment / at present
at the same time
• We say:
in the morning (s) but on Friday morning(s)
in the afternoon(s) but on Sunday afternoon(s)
in the evening(s) but on Monday evening(s)
• We say in a few minutes / in six months, etc:
The train will be leaving in a few minutes. (= a few minutes from now)
She’ll be here in a moment. (= a moment from now)
• We also use IN … to say how long it takes to do something:
I learnt to drive in four weeks. (= it took me four weeks to learn)