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.

Never make the same mistake TWICE.
Breaking Bad Season 3, Episode 11

TWICE,
Game of Thrones Season 1, Episode 5

we'll have TWICE the opportunities
Money Heist Season 3, Episode 7

I banished you, TWICE.
Game of Thrones Season 6, Episode 5

...and you don't have to not ask me TWICE.
The Big Bang Theory Season 8, Episode 24