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.

there isn't a man alive who could DEVISE
a more painful death for your little cunt.
Game of Thrones Season 2, Episode 8

The Gods could not DEVISE
a more perfect tongue.
Game of Thrones Season 3, Episode 8

Maybe you should DEVISE our next battle plan
while you're about it.
Game of Thrones Season 2, Episode 6

I don't know.
You'll have to DEVISE a scenario...
The Big Bang Theory Season 4, Episode 5

We must DEVISE a way
to raise their spirits.
Game of Thrones Season 7, Episode 4