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.

Now, I've lived my whole life dealing
with the fact that my TWIN brother is...
The Big Bang Theory Season 1, Episode 15

The Crown and the Faith
are the TWIN pillars of the world.
Game of Thrones Season 6, Episode 3

I already shared a uterus
with my TWIN sister.
The Big Bang Theory Season 12, Episode 19

are the TWIN pillars
upon which the world rests.
Game of Thrones Season 6, Episode 6