Prepositions are words that show the relationship between a noun or pronoun and another word in the sentence. There are three types of prepositions: simple prepositions like "in", "on", and "at"; compound prepositions like "about" and "above"; and phrase prepositions like "according to". Prepositions often indicate place, time, agency, possession, or reason. Common simple prepositions expressing place are "in", "on", and "at", which are used to denote different specific places or locations.

2.  Definition:
Preposition is a word placed before a
Noun or a Pronoun to show the relation of
noun or pronoun with something else in the
sentence.
1. There is a cow in the field.
2.He is fond of tea.
In sentence 1,the preposition ‘in’ joins a
noun to another noun. In sentence two, the
preposition ‘of’ joins Noun to Adjective. (tea
& fond )

3.  Kinds of Preposition.
Simple Preposition
Compound Preposition.
Phrase Preposition.
Simple Preposition.
in, on, at, by, for, from, of, off, till, to,
up, with.

4.  Compound Preposition:
about, above, across, along, amidst,
among, around, before, behind, below,
beneath, beside, between, beyond, inside,
outside, underneath, within, without.

5.  Phrase preposition.
according to, in accordance with, in
place of, in reference to, along with, on
behalf of, along with, because of , in
comparison to, by means of , in
consequence of, by reason of, by way of, for
the sake of ,in addition to, in case of, in
course of, in favour of, on account of,
owing to, in spite of, instead of, with regard
to.

6.  The most common relations indicated by
prepositions.
Place, Time, Agency, Possession,
Reason.
Place: in, on, at

7. In On at
He lives in
Chennai.
in India,
in UK
( big cities,
country)
The dog is
lying on the
floor.
The book is
on the table.
He is sitting
on the chair.
(place as a
surface)
He lives at
Sur.
(Also point
of place )
Small town
,village.

8. In On at
Before :year or
period.
Michael Jackson
died in 2010.
in 2012.
in 20th century.
in child hood.
Before: day, or
date.
He joined duty on 13th
September,2010.
on Monday.
on birthday.
Before the point of
time.
The exam started at
10 am.
at the moment
At present,
At dinner time,
At lunch time,
At breakfast time.

9.  Agency : ‘by’
The poem is written by John.
Possession: ‘of ’ , ‘with’
He is a man of courage.
A man with big moustache.
Reason: ‘for’, ‘of’
He is very strict for our good.
He died of cancer.

10.  Language Tips.
1. We are in the car / van.
2.We are on the bus, train, plane.
1.Vehicles do not permit freedom of
movement.
2.Vehicles permit freedom of movement.
( such as walking ,standing)

11.  By 6pm / at 6pm
by 6pm: at 6pm or earlier than 6 pm.
At 6 pm :at that point.
In time
around the time before or after.
On time
punctual

12.  Thank you !