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.

But they still don't PREPARE you
for what really happens here.
Vikings Season 1, Episode 8

You wanna PREPARE him?
The Big Bang Theory Season 2, Episode 12

Leonard, PREPARE
to be humbled
The Big Bang Theory Season 7, Episode 6

Prepare to charge.
Game of Thrones Season 6, Episode 9

(SIGHS) Very well,
PREPARE for a long night of deceit.
The Big Bang Theory Season 10, Episode 17