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.

Welcome home, Khaleesi.
Game of Thrones Season 6, Episode 3

Welcome.
The Big Bang Theory Season 10, Episode 8

- Thank you.
- You're WELCOME.
The Big Bang Theory Season 4, Episode 5

You like it so much, you're WELCOME
to chop off your own hand and take it.
Game of Thrones Season 4, Episode 1

You're very WELCOME.
Men like your husband...
Breaking Bad Season 3, Episode 8