- Dialogue is not like real-life conversation. It's more concise. Omit all those 'hellos' and 'goodbyes' and 'ums.'
- Don't use too many dialogue tags. Use as few tags as possible, without confusing the reader.
- Authors shouldn't write more than about four lines of uninterrupted dialogue. No soliloquies unless your name happens to end in Shakespeare.
- Characters should never talk about things they both already know. For example, a character should never say, "As you know, Bob, we've been married forty years."
- The exception to the above rule is: unless it's in a fight. For example, in an argument you could say something like, "Bob! We've been married forty years and you've never once picked up your socks!"
- Dialogue should serve a purpose such as moving the story forward, giving information, and/or contributing to characterization. The more it accomplishes, the better!
- Create subtext in your dialogue. How? Use non-verbal communication to suggest something different from what the characters are actually saying. Willis used some movie clips as examples. In the 1966 film Walk, Don't Run a couple sits in the back of a cab. The woman talks about how wonderful her fiancee is, all the while gazing in infatuation at the man sitting next to her (not her fiancee). The man starts kissing her and she kisses back and talks about wonderful fiancee "Mr." Haversack. It's a fun and effective scene.
What are your dialogue tips?