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Start speaking like the character every time you would write his dialog. Act while you write. Mimic his way of moving his body, the way which he speaks, the faces he does. This will provide you a...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/24613 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Start speaking like the character every time you would write his dialog. Act while you write. Mimic his way of moving his body, the way which he speaks, the faces he does. This will provide you a lot of immersion while you are writing, it will not only boost your productivity and quality but will also make the experience of writing more fun. Most of the time, I write most of the speeches of my characters just after my bath - where I spend a bit of time enacting them, just for fun, to get a feel about how _they_ would feel and sound in real life. Sometimes, taking acting classes (or even just playing make-believe with your kids, if you have them) can really boost your writing!