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.

Because I checked
the Sheep and Wool Festival website,
The Big Bang Theory Season 9, Episode 11

20,000 head of cattle. 50,000 SHEEP.
Game of Thrones Season 3, Episode 5

Leave one wolf alive
and the SHEEP are never safe.
Game of Thrones Season 7, Episode 1

Two hundred Northmen
slaughtered like SHEEP.
Game of Thrones Season 3, Episode 1

Good enough for killing SHEEP,
if the SHEEP don't fight back.
Game of Thrones Season 1, Episode 8