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.

You look terrified, My Lord Wigea.
Have you lost your FAITH?
Vikings Season 1, Episode 6

Of course, and the Faith
were armed on your orders.
Game of Thrones Season 5, Episode 6

the Faith and the Crown are the two
pillars that hold up this world.
Game of Thrones Season 6, Episode 8

Yeah. It kind of rekindles
your FAITH
The Big Bang Theory Season 5, Episode 11

you would this day
consecrate your FAITH to the Drowned God?
Game of Thrones Season 2, Episode 3