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.

Under the terms of my ROOMMATE
agreement I've had control...
The Big Bang Theory Season 3, Episode 2

Roommate Agreement?
The Big Bang Theory Season 5, Episode 18

Wait, wait. You had to leave the state
because your ROOMMATE was having sex?
The Big Bang Theory Season 1, Episode 5

...colleague and ROOMMATE?
The Big Bang Theory Season 6, Episode 2

and reinstate
the full Roommate Agreement.
The Big Bang Theory Season 5, Episode 15