A preposition is a word or a set of words that expresses the relationship between a noun or pronoun to other parts of the sentence.

Preposition	Examples
At	We meet you at the front door. She's sitting at the table near to the painting. The shop is at the end of the street.
By	We were shocked by what my cousin told us. Little Timmy was frightened by the fierce dog. Please come to the office by 8 a.m.
For	We feel deeply for your loss. This is all I have for today. The fans have been waiting at the airport for two hours
In	How much is the coat in the window? Jupiter is in the Solar System. The doctor will be back in an hour.
On	There are no prices on this menu. We expect a lot of parents on Graduation Day. Your suitcase is on top of the wardrobe.
Into	The magician poured the water into a paper cup. Please put the plates back into the cupboard. The boys jumped into the lake for a swim.
Of	Matt is a friend of mine. The highlight of the show is at the end. I had only four hours of sleep over the weekend.
Onto	The horses were loaded onto the trucks. The wallet fell from the table and onto the wet floor. My mother slipped as she stepped onto the platform.
To	My plan was to get it all arranged before telling anyone. This will be my second attempt to make a pizza. This letter is very important to your admission.