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.

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

You PREPARE for the scolding of your life.
The Big Bang Theory Season 6, Episode 9

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

Sometimes we PREPARE
a carnitas entrée
Breaking Bad Season 4, Episode 8

Very good. We'll PREPARE.
Game of Thrones Season 3, Episode 9