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.

Well, I wouldn't fight the EEL
The Big Bang Theory Season 9, Episode 9

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

I'll start you off easy.
Electric EEL, puffer fish, shrimp.
The Big Bang Theory Season 9, Episode 9

So I'd eat the EEL, fight the shrimp,
and befriend the puffer fish
The Big Bang Theory Season 9, Episode 9