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.

is doing a joint concert
with the San Gabriel Renaissance Choir.
The Big Bang Theory Season 10, Episode 15

You're preaching to the CHOIR, sister.
The Big Bang Theory Season 4, Episode 21