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.

If Lady Stark is
UNHAPPY with any aspect of my service,
Game of Thrones Season 3, Episode 2

Well, I am UNHAPPY.
The Big Bang Theory Season 5, Episode 20

I'm not UNHAPPY.
The Big Bang Theory Season 2, Episode 16

No, no, no! You're UNHAPPY there,
The Big Bang Theory Season 10, Episode 22

An UNHAPPY wife
is a wine merchant's best friend.
Game of Thrones Season 3, Episode 10