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.

I'm looking at spending the REST of my life
Game of Thrones Season 2, Episode 7

the REST of the week.
The Big Bang Theory Season 7, Episode 10

Where are the REST of the free folk now?
Game of Thrones Season 5, Episode 5

I assumed it was the REST
that did it.
Game of Thrones Season 7, Episode 3

- L'm sure we can figure the REST out.
- All right. (CLEARS THROAT)
The Big Bang Theory Season 10, Episode 15