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.

If you gave that glass to a man who was dying
of THIRST, he would be dead. You know why?
The Big Bang Theory Season 8, Episode 19

A man has a THIRST.
Game of Thrones Season 2, Episode 2

- Is something wrong?
- I have a THIRST.
Game of Thrones Season 1, Episode 7

One of the thieves had the audacity
to quench his THIRST...
The Big Bang Theory Season 3, Episode 13

...and we're being offered a cracker
to quench our THIRST.
The Big Bang Theory Season 2, Episode 18