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.

I weep for HUMANITY.
The Big Bang Theory Season 1, Episode 15

We're getting out due to HUMANITY,
Money Heist Season 1, Episode 4

Humanity never reckoned
with its own sins.
Westworld Season 3, Episode 8

...to guide HUMANITY
to a brighter tomorrow.
The Big Bang Theory Season 4, Episode 1

In these uncertain times,
doesn't HUMANITY deserve a gift?
The Big Bang Theory Season 4, Episode 1