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.

Well, fine.
Then I'll just HANG out with Wolowitz.
The Big Bang Theory Season 9, Episode 13

Hang on, are we talking about
murdering Dennis Kim?
The Big Bang Theory Season 1, Episode 12

So, HANG outwith me
and we'll have boys' night.
The Big Bang Theory Season 10, Episode 13

- I would like to propose an experiment.
- Hang on.
The Big Bang Theory Season 1, Episode 3

Well, HANG on, I'll come with you.
The Big Bang Theory Season 10, Episode 24