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.

In my experience, ELOQUENT men are right
every bit as often as imbeciles.
Game of Thrones Season 5, Episode 9

I will summon
my most ELOQUENT priests.
Game of Thrones Season 6, Episode 5

Well said. You're an ELOQUENT man.
Game of Thrones Season 5, Episode 9