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 don't know. Earl Grey?
The Big Bang Theory Season 12, Episode 23

(GREY WIND YOWLS)
Game of Thrones Season 3, Episode 9

GREY WORM: We will storm the city,
my queen.
Game of Thrones Season 8, Episode 4

Not even Grey Worm.
Game of Thrones Season 7, Episode 5

Grey Worm and the Unsullied
will sail for the Rock,
Game of Thrones Season 7, Episode 2