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.

but the question REMAINS,
by how much?
The Big Bang Theory Season 5, Episode 1

I can assure you,
our alliance with House Tyrell REMAINS...
Game of Thrones Season 5, Episode 6

until only one champion REMAINS,
The Big Bang Theory Season 9, Episode 8

has gathered what REMAINS of the
Tully forces and retaken Riverrun.
Game of Thrones Season 6, Episode 5

and this is what REMAINS.
Game of Thrones Season 5, Episode 7