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 turning a PROFIT?
We're coming close.
Breaking Bad Season 4, Episode 9

That's your entire PROFIT margin.
The Big Bang Theory Season 2, Episode 18

And how much PROFIT do you make
per Penny Blossom?
The Big Bang Theory Season 2, Episode 18

Unless there was a PROFIT in it.
Game of Thrones Season 1, Episode 9

Jimmy figured out how he could
use his talents to turn a PROFIT.
Breaking Bad Season 2, Episode 8