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 am guilty of DEPRAVITY,
Game of Thrones Season 6, Episode 10

and keep her from the
clutches of DEPRAVITY.
Game of Thrones Season 4, Episode 3