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.

A fucking LEGEND!
Game of Thrones Season 4, Episode 4

I was a fucking LEGEND in Gin Alley.
Game of Thrones Season 4, Episode 4

you never would have met
comic book LEGEND Stan Lee.
The Big Bang Theory Season 7, Episode 11

..."The Legend of Zelda: Twilight Princess,"
"Super Mario Bros."
The Big Bang Theory Season 3, Episode 13

..."Final Fantasy I" through "IX,"
"The Legend of Zelda: Ocarina of Time"...
The Big Bang Theory Season 3, Episode 13