Some of my characters have been really chatty recently and it can be a problem…
I am back at it with my longest novel to date and really writing dialogue in sections where the prose gets a bit heavy. There are rules to writing dialogue which I find a bit tricky. Like you want to give them colloquium language but you don’t want to keep spelling out “Alright” or “I don’t know what to say” even if they are the tics of these characters. You want dialogue that actually means something to the story which is why I think writing in close third person can be tricky as you often think when a person might say. Add in that your main character is introspective and introverted, your chances of getting them to speak out loud like a character in a novel.
Have ever noticed the characters you like the most start chatting to each other? When you get to that point in the writing where you have done character development and as I suggested before, worked out their quirks, then the characters themselves start to take the steer. Part of me likes to think that this is because I am deeply acquainted with the people so I know what they would say or do. But really it’s because these people you have created have come alive and are demanding attention. (If you want to understand this perspective, I would recommend the book Bunny by Mona Awad that I reviewed here.) So once they are so alive to you, they do something else weird: they start talking to each other.
Recently I have written two arguments that happen as she befriends the enemy of the piece. One reason was that I had started to realise there wasn’t enough conflict in the novel; got to give these characters problems. Goodness knows life throws me enough lemons, and by rights you should be chucking lemons at their heads throughout the rising action. As she wrestles with the problems with her neighbours and friends, my main character seems quite meek. I could find quite easily how others speak to her bit it was more tricky to get her to speak out loud.

Here were some tricks I tried to get the arguments going:
1. Ignore the actions
To start the scenes with arguments I didn’t getting her to the place but started writing where she already is. The setting isn’t important because if you are picturing it, you known where they are. Once I had started one scene I knew she was on the bottom step, looking up awkwardly but the words have already told us she is been treated as a subordinate.
2. Say it out loud
Saying the words you’ve written helps the dialogue feel more real. I also get Word to read out my work to me to help spot those double words or odd sounding phrases.
3. Act it out
I am a wannabe actor as well as writer and this is where those years of improv play out. Playing my characters as I sit before the computer is one of the reasons I crave alone time! I think understanding the rules of drama (start late, leave early, for example) helps us write dialogue. I haven’t written a play since A Level but some of those skills still help.
4. Record it while walking
My final tip is to say it out loud when you’re walking. I think walking is a great trick for getting your mind mulling over things. Especially if you dare to go distraction free. If ideas hit me when I walk, I like to record using voice memos. It’s a great to really have that argument. Although my final tip would be to find a quiet spot to say it out loud!