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.

Your father understood the importance
of keeping Dorne in the FOLD.
Game of Thrones Season 5, Episode 9

What if we don't FOLD our clothes at all?
The Big Bang Theory Season 10, Episode 23

I am not gonna FOLD.
The Big Bang Theory Season 3, Episode 7

So the only question is,
how long until you FOLD?
The Big Bang Theory Season 3, Episode 7

If you give them your love:
they will return it a thousand FOLD.
Game of Thrones Season 3, Episode 4