A preposition is placed before a noun or pronoun. It shows the relationship between the noun and/or pronoun in the same sentence.
A preposition or position shows the location of a person, place or an object (e.g. behind, between, next to, opposite, in the middle of, in front of).
There is a large fountain in the middle of the park.
The letter is in the mailbox.
There's a snake behind the cupboard!
A preposition of direction shows which direction the subject in coming from or going to (e.g. across, into, over, down, through, towards).
The dog ran across the field.
The cat entered through that hole.
He walks carefully along the street.
A preposition of time shows when an action was done or will be done (e.g. after, before, during, since, by, at, on, in).
** 'at' for a precise time;
e.g. The class ended at 2 o'clock.
** 'on' for days and dates;
e.g. The meeting is on Friday.
** 'in' for months, years, centuries and long periods.
Our country gained its independence in 1957.
Fill in the blanks with the correct prepositions.
1. The boy ran _____ of the house.
2. I will see you _____ an hour.
3. These presents are _____ my aunt.
4. The birds are flying _____ the tree.
5. My house is _____ the post office.
6. I went to Liana's house _____ finishing my homework.