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.

Whenever I got into the PIT
against a beast like that one,
Game of Thrones Season 5, Episode 9

you will fight at the Great Pit of
Daznak itself, in front of the queen.
Game of Thrones Season 5, Episode 7

"Oh, My God, a prune PIT!"
The Big Bang Theory Season 7, Episode 21

Yeah, what about Kryptonian PIT stains?
The Big Bang Theory Season 2, Episode 11

How many dragons
did you see at the PIT?
Game of Thrones Season 7, Episode 7