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.

- Would you like to share a CAB?
- That would be fine.
The Big Bang Theory Season 10, Episode 1

All we know is
they shared a CAB and had a nightcap.
The Big Bang Theory Season 10, Episode 1

I was just about
to call a CAB.
The Big Bang Theory Season 12, Episode 4

than share a CAB and a conversation.
The Big Bang Theory Season 10, Episode 1

No-- it's fine, she likes
to take a CAB or a shuttle.
The Big Bang Theory Season 12, Episode 22