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.

by going into the bathroom
at the BUS station.
The Big Bang Theory Season 10, Episode 6

the first BUS and hightailed it
down here to shake your hand.
The Big Bang Theory Season 5, Episode 7

behind a BUS
and you won't go around it?
The Big Bang Theory Season 7, Episode 3

They're on a
celebrity BUS tour.
The Big Bang Theory Season 12, Episode 18

if the BUS had
an unknowable number of parts.
The Big Bang Theory Season 12, Episode 23