One of the writer's in my critique group posed a question the other day. She was having trouble with character dialogue.All of her characters sound the same. She said, If it's going to rain, wouldn't the character just say that. "It's going to rain. Or it's raining". No matter who they were.
The answer of course is...bzzzz... wrong. If every character had the same way of phrasing something, there would be no character at all. Here are a few examples.
"Tut, Tut, looks like rain"- Winnie-the -Pooh
"The nicest thing about rain is that it always stops. Eventually." - Eeyore
"There's a storm blowin' up - a whopper, to speak in the vernacular of the peasantry" Professor Marvel, Wizard of OZ
"My breasts can always tell when its going to rain" Karen on Mean Girls
You get my drift. Characters are interesting and memorable because they have interesting and memorable things to say. A person is 3 dimensional, with a past and personality that colors their word choice.
Here's an exercise. Your character needs to say they're hungry.
Pooh would say "I've got a rumbly in my tumbly."
How would a colonist from space say it?
An 11 yr old?
Have fun and be creative!!