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.

Yeah, right here on his COUCH.
The Big Bang Theory Season 4, Episode 9

- What's going on?
- Shh. Ramona's sleeping on the COUCH.
The Big Bang Theory Season 2, Episode 6

I can't sleep on your COUCH.
I sleep in a bed.
The Big Bang Theory Season 2, Episode 21

Yeah. It's cleaner
than my COUCH.
The Big Bang Theory Season 5, Episode 2

Television teaches us that the man
is supposed to sleep on the COUCH.
The Big Bang Theory Season 10, Episode 16