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.

...at another QUINTESSENTIAL Rock, Paper,
Scissors, Lizard, Spock moment.
The Big Bang Theory Season 2, Episode 8

He's not just a middle child,
he is the QUINTESSENTIAL middle child.
The Big Bang Theory Season 1, Episode 10