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 want to have
a CONTEST, Karen?
The Big Bang Theory Season 12, Episode 13

Oh, my... It's
not a CONTEST.
The Big Bang Theory Season 7, Episode 22

...have an old-fashioned
eating CONTEST?
The Big Bang Theory Season 3, Episode 10

What's the prize
to winning this stupid CONTEST?
Game of Thrones Season 4, Episode 1

All right, standard state fair
pie-eating CONTEST rules are...
The Big Bang Theory Season 6, Episode 4