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.

This is your city Stannis MEANS to sack.
Game of Thrones Season 2, Episode 9

It MEANS we're fine, okay?
Breaking Bad Season 5, Episode 14

Strand: Which MEANS you knew
how much it was worth
on the open market.
Westworld Season 2, Episode 7

I know what it MEANS.
I went to law school.
The Big Bang Theory Season 3, Episode 16

It MEANS a great deal to me.
Game of Thrones Season 6, Episode 3