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.

When I heard that Joffrey's DOG had tucked tail
and run from the Battle of the Blackwater,
Game of Thrones Season 4, Episode 1

- Classy DOG.
- Yes.
The Big Bang Theory Season 6, Episode 22

...a hot DOG stand
in a converted railroad dining car.
The Big Bang Theory Season 4, Episode 6

You'll die soon enough, DOG.
Game of Thrones Season 3, Episode 4

The hybrid DOG and octopus.
The Big Bang Theory Season 4, Episode 2