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.

And it's only
his first DEALING rap,
Breaking Bad Season 2, Episode 8

You're wrong if you think
you're DEALING with an idiot.
Money Heist Season 3, Episode 4

So exactly what kind of contaminant
are we DEALING with here?
Breaking Bad Season 3, Episode 10

You know, DEALING
with cold feet
The Big Bang Theory Season 11, Episode 12

We need to be careful
in DEALING with such a man.
Game of Thrones Season 6, Episode 4