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.

the emotional toll of KNOWING
there's a child out there
The Big Bang Theory Season 12, Episode 12

How does it feel
KNOWING those men all died
Game of Thrones Season 2, Episode 8

Knowing that you may never
wake up again.
Breaking Bad Season 3, Episode 8

without even KNOWING what it meant.
Game of Thrones Season 8, Episode 2

{\i1}without KNOWING what's going on.{\i0}
Money Heist Season 3, Episode 6