Prepositions are a very important part of English sentence. A preposition is a word that shows the relationship between a noun or a pronoun and other words in the sentence.

There are about 150 prepositions in English. On, in, at, by, under, above, beside, to, out, from, for are some of the most common preposition words. Prepositions are used more frequently than other individual words. For example, the prepositions of, to and in are among the ten most frequent words in English.

The two most common usages of prepositions are: 1. to introduce an object, and 2. when they are words or groups of words that, when used with a noun, pronoun, or noun phrase, express direction, location, or time:
She put the pen on the desk.
We went into the hall.
We meet at 6 am.
The plane under the radar
He is dashing to make the flight.
This was for you.

The word “preposition” comes from the Latin word praeponere (put before.)

Prepositions usually come before the noun or the pronoun.

Prepositions are also used to introduce an object, and these are called dependent prepositions:

At
e.g. glance, laugh, wait
Mimi laughed at the cartoon
I waited at the front gates

Of
e.g. approve, consist, died, smell
She doesn’t approve of that man
My room consists of a bed.
The car smells of mould

For
e.g. call, ask, look, caring, prepare
We asked for the bill.
Don’t look for love there.
Shane has been caring for his mother.
Prepare for the cold winters here!