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.

Yeah, everybody's HAPPY. Great.
The Big Bang Theory Season 6, Episode 9

BOTH:
Happy Valentine's Day!
The Big Bang Theory Season 12, Episode 24

I just thought it would make you HAPPY.
The Big Bang Theory Season 10, Episode 17

You know,
what would make me HAPPY
The Big Bang Theory Season 12, Episode 20

I'd like to make you HAPPY, Vala.
Game of Thrones Season 6, Episode 3