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.

If I was PRONE to sarcasm...
The Big Bang Theory Season 6, Episode 19

Humanity is disorganized,
PRONE to destruction.
Westworld Season 3, Episode 8

...who's PRONE to canker sores
and pinkeye?
The Big Bang Theory Season 4, Episode 23

She was always PRONE to melancholy.
Game of Thrones Season 4, Episode 8

Perhaps even taller, smarter
and less PRONE to freckling.
The Big Bang Theory Season 1, Episode 15