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.

- It's only $800?
- Yeah. And that's my BID.
The Big Bang Theory Season 1, Episode 14

I BID you all a good day.
Vikings Season 1, Episode 3

Do as you're BID, child.
Game of Thrones Season 1, Episode 10

- You BID $800?
- It was a spur-of-the-moment thing.
The Big Bang Theory Season 1, Episode 14

I understand why no one else BID.
The Big Bang Theory Season 1, Episode 14