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.

Howard said I could BORROW it,
Bernadette said forever.
The Big Bang Theory Season 10, Episode 22

Could I BORROW your watch, sir?
The Big Bang Theory Season 12, Episode 10

By the way, can I BORROW
your bullwhip and fedora?
The Big Bang Theory Season 6, Episode 5

You know, can I
BORROW that movie?
The Big Bang Theory Season 5, Episode 17

I'd like to BORROW one of your birds.
Game of Thrones Season 5, Episode 3