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.

You're about to be one of the first
audiences to see Suicide Squad.
The Big Bang Theory Season 9, Episode 19

- Where's the rest of your SQUAD?
- Uh...
The Big Bang Theory Season 2, Episode 16

I don't want the goon SQUAD rolling
in and stealing our shot, you know?
Breaking Bad Season 5, Episode 8

First Squad, Seventh Company of El Goloso:
Moncloa Palace.
Money Heist Season 3, Episode 2

- The ladies?
- Perpetual Motion Squad...
The Big Bang Theory Season 1, Episode 13