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 care if
you're the Employee
of the fuckin' Month.
Westworld Season 2, Episode 7

I'm not leaving the Bank until
the last EMPLOYEE has left.
Money Heist Season 3, Episode 3

I'm menial EMPLOYEE of the month.
The Big Bang Theory Season 3, Episode 14

That's what makes you
a good EMPLOYEE.
The Big Bang Theory Season 12, Episode 13