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 much less BORING than these others.
Game of Thrones Season 3, Episode 2

And she found atomic spectroscopy BORING.
I wouldn't coitus her with your genitals.
The Big Bang Theory Season 9, Episode 8

The world's most BORING liquid
and the world's most BORING vegetable,
The Big Bang Theory Season 10, Episode 13

Some friends. They all think I'm BORING.
The Big Bang Theory Season 6, Episode 5

I've had an exciting life.
I want my death to be BORING.
Game of Thrones Season 5, Episode 4