The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

I asked him,
"How can a man be BRAVE if he's afraid?"
Game of Thrones Season 2, Episode 8

You must be BRAVE.
Game of Thrones Season 2, Episode 8

I was told that BRAVE men
killed them all.
Game of Thrones Season 1, Episode 4

BRAVE man to put an embarrassing
story like that
The Big Bang Theory Season 12, Episode 18

I want to be BRAVE.
Game of Thrones Season 6, Episode 10