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.

...and I pay attention to the things
you are INTERESTED in.
The Big Bang Theory Season 3, Episode 16

"If INTERESTED, solve the following
puzzles for a chance to meet him."
The Big Bang Theory Season 9, Episode 8

If you're INTERESTED,
The Big Bang Theory Season 5, Episode 17

I'm not INTERESTED in foul rumors.
Game of Thrones Season 3, Episode 2

I presented it to them,
and they were INTERESTED.
The Big Bang Theory Season 11, Episode 8