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.

For example, I'm seriously considering
asking that BUSBOY...
The Big Bang Theory Season 3, Episode 11

No, I'd rather have the BUSBOY.
The Big Bang Theory Season 3, Episode 11

Sheldon, wait. This isn't even what I do.
I'm a waitress, not a BUSBOY.
The Big Bang Theory Season 3, Episode 14