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.

Oh, and one last thing, if you find
yourself working with a male SCIENTIST
The Big Bang Theory Season 10, Episode 23

I'm a SCIENTIST.
I never apologize for the truth.
The Big Bang Theory Season 3, Episode 16

Yeah, you're a SCIENTIST.
The Big Bang Theory Season 4, Episode 21

Donnie was a rocket SCIENTIST...
The Big Bang Theory Season 4, Episode 9

Fig Newtons were named after a town
in Massachusetts, not the SCIENTIST.
The Big Bang Theory Season 3, Episode 10