"I have a preposition for you."

A preposition is used to link nouns, phrases and pronouns to other words in a sentence. The word the preposition is introducing is that

prepositions object. When a preposition is used, it often indicates the relationship it's object has to the rest of the paragraph.
Example:
"What have I ever done to make you treat me so disrespectfully? If you'd come to me in friendship, then this scum that ruined your daughter would be suffering this very day. And if by chance an honest man like yourself should make enemies, then they would become my enemies. And then they would fear you. " - Don Carleone

Here are the rules: (compliments of GrammarBook.com @ http://www.grammarbook.com/grammar/probPrep.asp)

Rule 1. You may end a sentence with a preposition. Just do not use extra prepositions when the meaning is clear without them.
Examples:
Correct: That is something I cannot agree with.
That is something with which I cannot agree.
Correct: How many of you can I count on?
Correct: Where did he go?
Incorrect: Where did he go to?

Rule 2. Use on with expressions that indicate the time of an occurrence.
Examples: He was born on December 23.
We will arrive on the fourth.

Rule 3. 0f should never be used in place of have.
Correct: I should have done it.
Incorrect: I should of done it.

Rule 4. Between refers to two. Among is used for three or more.
Examples: Divide the candy between the two of you.
Divide the candy among the three of you.

Rule 5.
The word like, when used to show comparison, is a preposition, meaning that it should be followed by an object of the preposition but not by a subject and verb. Use the connectors (also called conjunctions) as or as if when following a comparison with a subject and verb.
Examples: You look so much like your mother.
Mother is the object of the preposition like.
You look as if you are angry.
As if is connecting two pairs of subjects and verbs.

So there you have it.

"This is the business we chose."