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I'll say what has been said in my own way: A long block of JUST dialogue is generally an under-imagined scene. The dialogue takes place in a setting, with its own sights, sounds, smells and temper...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/36413 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/36413 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I'll say what has been said in my own way: A long block of JUST dialogue is generally an under-imagined scene. The dialogue takes place in a setting, with its own sights, sounds, smells and temperature and humidity and interruptions. If the characters are telling each other things they don't know; they have reactions and private thoughts. Most people are doing things as they talk (or you can make sure they are doing things). Take a drink. Look up to think. Take a deep breath. Your MC can think of an argument, but doesn't argue it. Anytime you see a stretch of dialogue that is not explicitly a speech to several others, it should be interspersed with actions, thoughts, conversational conflict (misunderstandings, interruptions for clarification, arguments against a claim, etc), facial expressions, etc. Have a conversation while somebody is getting dressed, or cooking, or doing laundry. Or at work, dealing with interruptions, or constantly getting text alerts on their phone and reading them. Dialogue IS action, but it should be fully imagined, in a setting, with emotional reactions and real life happening around them. Even minor throwaway conflicts (meaning they don't change the plot or characters, jump up when the microwave beeps to get your warmed over coffee). Keep the reader grounded in your imagined reality, don't go a hundred words without touching something real. Don't let them disconnect and drift into a white room of just noise. Imagine yourself trying to hold a conversation from a sensory deprivation tank, with your eyes closed, only able to hear a voice on the phone. It is an _incomplete_ experience to just have a wall of dialogue.