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.

Very TASTY.
Game of Thrones Season 3, Episode 6

This venison, it's very TASTY.
Game of Thrones Season 6, Episode 6

Well, they're pretty TASTY.
The Big Bang Theory Season 3, Episode 1

If there as TASTY as this soup.
It’s the best one I’ve ever tasted
Money Heist Season 1, Episode 13

He's always been very cagey about what
he puts in his egg salad to make it so TASTY.
The Big Bang Theory Season 6, Episode 8