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.

...our genetic material
has the POTENTIAL of producing the first...
The Big Bang Theory Season 4, Episode 1

This was a POTENTIAL issue,
The Big Bang Theory Season 10, Episode 12

Mr. White must've seen
some POTENTIAL in Jesse.
Breaking Bad Season 2, Episode 2

angular momentum, POTENTIAL energy
and kinetic energy.
The Big Bang Theory Season 10, Episode 16

I see a POTENTIAL partner.
Game of Thrones Season 2, Episode 10