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.

I want you in REHAB.
Okay. I'll go first thing tomorrow.
Breaking Bad Season 2, Episode 12

She refuses to go to REHAB,
and when we force her,
she refuses to stay.
Westworld Season 2, Episode 9

Unfortunately, we weren't able
to convince him to go to REHAB.
The Big Bang Theory Season 1, Episode 10

...is more emotionally valuable
than help he would get at REHAB.
The Big Bang Theory Season 1, Episode 10

You're going back to REHAB.
Today. Now.
Breaking Bad Season 2, Episode 12