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Dialogue is what the character says.
Speak to each other
Dialog show how a character speaks so you can see the level of education and regional area where he or she lives.
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Is when the author speaks with a certain character
Font
Emphasis in dialog is best left to the director and the actor. However, if you choose to emphasize a piece of dialog early on in the film script as a clue, or as a character tag, or as a red herring, or in a V.O. or O.S. line, type the word in caps. Use only one or two of these in an entire script, otherwise your script could be considered 'amateurish'. .
character
Character scale
the script
It will have the name of her character and a colon
Dialogue is what the character(s) is/are saying.