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.

Oh, I understand
the CONFUSION.
The Big Bang Theory Season 5, Episode 21

And in the CONFUSION,
Juan was shot dead.
Breaking Bad Season 4, Episode 8

Oh, I see your CONFUSION.
You don't understand.
The Big Bang Theory Season 7, Episode 4

I understand your CONFUSION,
The Big Bang Theory Season 5, Episode 20

a Helmet of Confusion spell
on Billy the Kid's cowboy hat?
The Big Bang Theory Season 5, Episode 10