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.

Cover your eyes.
The Big Bang Theory Season 5, Episode 4

...that Elliot and Gretchen's money
didn't COVER everything.
Breaking Bad Season 3, Episode 9

with the Jim Lee alternate
COVER that you wanted.
The Big Bang Theory Season 5, Episode 5

Take COVER!
Money Heist Season 1, Episode 12

Take COVER!
Game of Thrones Season 7, Episode 4