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 don't understand why in this GROUP
I never get my way.
The Big Bang Theory Season 3, Episode 17

Perhaps Howard meant passive-aggressive
like asking our GROUP to help on your project...
The Big Bang Theory Season 8, Episode 21

How could there be?
Who would be the control GROUP?
The Big Bang Theory Season 1, Episode 10

who assembled a GROUP
of wise men
The Big Bang Theory Season 7, Episode 20

your GROUP has become--
willing to sail out
The Big Bang Theory Season 5, Episode 6