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.

Did I seem scared the other DAY?
Game of Thrones Season 3, Episode 6

The second afternoon they were gone
was the hottest DAY in the three-year summer.
Game of Thrones Season 2, Episode 8

So set some aside.
Save it for a rainy DAY.
Breaking Bad Season 4, Episode 7

My husband, the DAY before that.
Game of Thrones Season 2, Episode 4

Why'd you set it
for the DAY before yesterDAY?
The Big Bang Theory Season 1, Episode 14