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.

Thought you wanted
to ride at SUNUP.
Westworld Season 2, Episode 6

Then I guess we'll...
start walkin' at SUNUP.
Westworld Season 2, Episode 6

He used to drink from sundown to
SUNUP, visit three brothels a night,
Game of Thrones Season 3, Episode 10