The first step is to choose each character's voice. It is most helpful to choose a voice you have heard and give the character that same style and pattern of speech.
Tell students to think about the various people in their lives. They can think about their closest family and friends, but remind them to think about, for example, the old man who chatted with them on the bus one day, or the loud neighbor gossiping in her yard. People whose speech patterns have a personal, unique flair are very useful to think about in this context.
Tell students to remember what people sounded like when speaking. Remember their speech patterns, their quirks, the types of phrases they would repeat. Did they speak slowly or quickly? Were they especially verbose or concise? Writers must listen to those individual voices in their memories.