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.

Maybe the comic-book store
doesn't have a BULLETIN board.
The Big Bang Theory Season 1, Episode 15

There was a flyer on the BULLETIN board
at the university:
The Big Bang Theory Season 2, Episode 13