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.

Ser Davos is perfectly CAPABLE
of waving a torch on his own.
Game of Thrones Season 8, Episode 2

When someone is CAPABLE of making
a decision that way, unhesitatingly,
Money Heist Season 1, Episode 8

Yes. Now he knows
what bathtubs are CAPABLE of doing...
The Big Bang Theory Season 2, Episode 12

I am smart, I'm CAPABLE,
and I can make a difference.
The Big Bang Theory Season 12, Episode 19

As you know, Bernard,
we are CAPABLE of change.
Westworld Season 2, Episode 10