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.

I can't believe the WAITER
thought I was your daughter.
The Big Bang Theory Season 7, Episode 14

Oh, that poor WAITER.
The Big Bang Theory Season 8, Episode 3

- Thank you.
- My pleasure. Waiter?
The Big Bang Theory Season 6, Episode 1

Waiter.
The Big Bang Theory Season 5, Episode 14

- That's okay. I just won't eat them.
- Don't be ridiculous. Waiter?
The Big Bang Theory Season 6, Episode 23