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.

whatever, because
he's always got a 6-inch
CUSHION of air under his feet.
Breaking Bad Season 2, Episode 10

I still don't like this CUSHION.
The Big Bang Theory Season 2, Episode 16

That was for my CUSHION.
The Big Bang Theory Season 2, Episode 16

You're giving me a couch CUSHION?
The Big Bang Theory Season 4, Episode 7

This CUSHION experienced
a nude revenge wiggle.
The Big Bang Theory Season 6, Episode 9