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. That was a RUSE.
The Big Bang Theory Season 6, Episode 3

It's time to sell this RUSE.
Westworld Season 2, Episode 5

There lies our RUSE.
Money Heist Season 3, Episode 2

Yes! It's not a RUSE
to make fun of me.
The Big Bang Theory Season 7, Episode 3

No. You mean
this was all a RUSE?
The Big Bang Theory Season 5, Episode 7