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.

I make a statement about your PAST.
If I'm wrong, I drink.
Game of Thrones Season 6, Episode 3

for the PAST five years
just got approved by the FDA.
The Big Bang Theory Season 12, Episode 17

In the PAST few weeks,
The Big Bang Theory Season 5, Episode 4

Since I've missed the PAST
several Small Council meetings,
Game of Thrones Season 6, Episode 4

"You allowed thousands of wildlings
PAST the Wall.
Game of Thrones Season 6, Episode 4