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.

Am l supposed to MEMORIZE this?
We need to practice.
Breaking Bad Season 4, Episode 4

What?
Why the hell did I MEMORIZE the Pledge?
The Big Bang Theory Season 9, Episode 21

Made me MEMORIZE
every damn city, town,
Game of Thrones Season 7, Episode 1

All right, I cared enough to MEMORIZE
that stupid joke, but that's all I care.
The Big Bang Theory Season 2, Episode 19