I assume you meant to type "preposition" which is a word that describes the relative location or POSITION of a noun. Examples include about, during, after, along, within, to, near, and so forth. Hope this helped.
Answer:
Reasons for the character doing a certain thing. There's a lot of cause and effects. If the antagonist is doing something that is say villainous the protagonist has to correct that. This creates the entire plot of the story. Motivation behind the doing.
I would think she was hearty it sounds like..