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.

Go buy some beef JERKY.
The Big Bang Theory Season 5, Episode 13

I don't want beef JERKY.
The Big Bang Theory Season 5, Episode 13

like it was a
piece of JERKY.
The Big Bang Theory Season 12, Episode 21

lowfat turkey JERKY...
The Big Bang Theory Season 5, Episode 19