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 work with Mr. Wolowitz
here at the university, CORRECT?
The Big Bang Theory Season 4, Episode 7

to murder Stuart?
Correct.
The Big Bang Theory Season 7, Episode 18

- That is CORRECT.
- I knew that too.
The Big Bang Theory Season 1, Episode 13

GABLEHAUSER:
Correct.
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GABLEHAUSER:
Correct.
The Big Bang Theory Season 1, Episode 13

Sure it's on
the CORRECT side?
Breaking Bad Season 4, Episode 2