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.

Of course you feel terrible. You completely
screwed up your KARMA, dude.
The Big Bang Theory Season 2, Episode 22

If you really want to clean up your KARMA,
go get my freaking latte.
The Big Bang Theory Season 2, Episode 22