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 became the Three-Eyed Raven.
Game of Thrones Season 7, Episode 7

So, you've been dreaming
of a three-eyed RAVEN again?
Game of Thrones Season 2, Episode 5

A RAVEN came from the Citadel.
Game of Thrones Season 6, Episode 10

The RAVEN brought more news.
Game of Thrones Season 1, Episode 1

We need to send a RAVEN!
Game of Thrones Season 7, Episode 6