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.

An opera SINGER, the cast of Stomp.
The Big Bang Theory Season 2, Episode 19

We're lucky he's a SINGER.
Game of Thrones Season 5, Episode 7

"Sammy Hagar replaced David Lee Roth
as the lead SINGER in what group?"
The Big Bang Theory Season 1, Episode 13

A better dancer than a SINGER, I'm afraid.
Game of Thrones Season 3, Episode 8

All right. "Singer who sang
'Oops!... I Did It Again'?"
The Big Bang Theory Season 1, Episode 13