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.

...and got a GIG playing
Knott's Berry Farm.
The Big Bang Theory Season 1, Episode 13

Dude, the GIG is,
like, next weekend.
The Big Bang Theory Season 11, Episode 13