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.

Oh, God, just
finish the SENTENCE.
The Big Bang Theory Season 5, Episode 11

SENTENCE you to die.
Game of Thrones Season 3, Episode 10

I don't know a nice way
to finish this SENTENCE.
The Big Bang Theory Season 11, Episode 10

a prison SENTENCE reduction,
that in one or two years you’ll be out.
Money Heist Season 1, Episode 11

the judge will give a reduced SENTENCE.
Money Heist Season 1, Episode 10