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.

Like Lord Duckling or King Turtle.
Game of Thrones Season 5, Episode 3

All right, Lesser Demon Turtle.
The Big Bang Theory Season 6, Episode 2

When I was 12 I milked my eel
into a pot of TURTLE stew.
Game of Thrones Season 1, Episode 6

I made the bald man cry
into the TURTLE stew,
Game of Thrones Season 1, Episode 6

Tortoise, TURTLE,
what have you.
Breaking Bad Season 2, Episode 10