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.

Well, what about
those NINE guys in jail?
Breaking Bad Season 5, Episode 8

I'm back down
to NINE friends!
The Big Bang Theory Season 7, Episode 10

I stopped being a child when I was NINE.
Game of Thrones Season 3, Episode 10

Eight. Nine.
The Big Bang Theory Season 8, Episode 19

Oh, he once spent NINE months
with my legs wrapped around his head.
The Big Bang Theory Season 1, Episode 15