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.

- I need your official ANSWER.
- No, I decline to provide one.
The Big Bang Theory Season 1, Episode 13

Okay, just ANSWER me
this one question:
Breaking Bad Season 5, Episode 12

I change my ANSWER. It's amazing, it's hot.
The Big Bang Theory Season 8, Episode 23

The ANSWER will be the same.
Game of Thrones Season 2, Episode 5

Wait, before you give me
an ANSWER seriously, I want...
Money Heist Season 1, Episode 13