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.

Covering fire!
Money Heist Season 1, Episode 12

Thanks for COVERING for me.
The Big Bang Theory Season 11, Episode 17

I was too busy COVERING my heinie
on Amy's stupid astronaut story.
The Big Bang Theory Season 4, Episode 22

LEONARD:
Howard, why aren\'t you covering us?
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LEONARD:
Howard, why aren\'t you covering us?
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LEONARD:
Howard, why aren't you COVERING us?
The Big Bang Theory Season 2, Episode 16

Penny was just COVERING for me.
The Big Bang Theory Season 10, Episode 7