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.

People can't live on GRASS.
Game of Thrones Season 1, Episode 2

Well, then I guess bring a blanket.
The GRASS gets damp at night.
The Big Bang Theory Season 8, Episode 24

The Dothraki have two things
in abundance - GRASS and horses.
Game of Thrones Season 1, Episode 2

Khaleesi of the Great Grass Sea,
Game of Thrones Season 4, Episode 6

Khaleesi of the Great Grass Sea,
Game of Thrones Season 6, Episode 1