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 saw Craster take his OWN baby
boy and leave it in the woods.
Game of Thrones Season 3, Episode 1

The Dothraki do things in their OWN time,
for their OWN reasons.
Game of Thrones Season 1, Episode 7

The more I think about it, the more intrigued
I am about having our OWN store.
The Big Bang Theory Season 8, Episode 4

Helsinki, leave them on their OWN,
they’ll need to talk.
Money Heist Season 1, Episode 10

They'll give you ships and soldiers
and they'll OWN you forever.
Game of Thrones Season 2, Episode 5