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 hope you'll excuse me for saying it,
but BELIEF is so often the death of reason.
Game of Thrones Season 5, Episode 8

So I said, "No, thank you," to BELIEF.
Game of Thrones Season 6, Episode 10

Ghost Rider movie
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"and his insane BELIEF
that the Ghost Rider movie
The Big Bang Theory Season 9, Episode 18

to radical doubt so that he
could build a bedrock BELIEF
The Big Bang Theory Season 12, Episode 10

It is my BELIEF that a moment of chaos
affords opportunities lost soon after.
Game of Thrones Season 2, Episode 6