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The phrase "more brave" is correct and can be used in written English.
You can use it to describe someone or something that is braver than usual. For example, "The soldier was more brave than any other soldier on the battlefield."
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The trio's commitment to this new reality – more Brave New World than a brave new world – is tartly funny, and Hoyle's lobotomised smile ("from now on, there'll be no more criticising anything …") could stun a Mumford at 10 paces.
They are more brave and committed than I am.
She wrote: Do what is more difficult & more brave.
He's gotten much more brave and has a lot of spunk".
Either they are more afraid or more brave than I am.
"It's easier to fight online, because you feel more brave and in control," she said.
Female characters for the under-fives don't come more brave or bold than this.
"But this has made me feel a little more brave about putting myself out there.
"He couldn't be more brave or more collaborative, and even encouraged me to do more things.
The more timid nodded their head and those more brave said yes".
Or, I suppose, she was more than who I thought she was: more complex, more brave, more tragic.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com