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'm supporting my COMMUNITY.
Breaking Bad Season 3, Episode 8

Now the whole scientific
COMMUNITY knows I was wrong.
The Big Bang Theory Season 7, Episode 10

we're gonna get the scientific
COMMUNITY behind us.
The Big Bang Theory Season 12, Episode 18

...not graduating
from COMMUNITY college, okay?
The Big Bang Theory Season 2, Episode 1

The science world is
a small COMMUNITY. People talk.
The Big Bang Theory Season 12, Episode 19