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.

Honestly, it's gonna be HARD
when we both go back to work.
The Big Bang Theory Season 11, Episode 17

Well, it's HARD.
The Big Bang Theory Season 8, Episode 18

It's HARD to put into words.
Game of Thrones Season 2, Episode 7

CUOCO:
We were laughing so HARD,
The Big Bang Theory Season 12, Episode 24

No HARD feelings.
Breaking Bad Season 5, Episode 14