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.

If you pull a BUTTERSCOTCH
out of your pocket,
The Big Bang Theory Season 10, Episode 9

- Butterscotch scone?
- Thanks.
The Big Bang Theory Season 3, Episode 15

Wonderful, and the pilot did
such a good job I gave him a BUTTERSCOTCH.
The Big Bang Theory Season 9, Episode 14