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.

Just a warning, Sheldon.
The freezer locks from the OUTSIDE.
The Big Bang Theory Season 2, Episode 23

I could hear you from the OUTSIDE.
Money Heist Season 1, Episode 4

...and I'm dark on the OUTSIDE.
The Big Bang Theory Season 8, Episode 24

...but the added fun of subatomic particles
and waves OUTSIDE the visible spectrum.
The Big Bang Theory Season 8, Episode 19

My company doesn't allow me
to socialize with doctors OUTSIDE of work.
The Big Bang Theory Season 8, Episode 7