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.

That's the DYNAMIC-- I'm the
fun one, you're the buzzkill.
The Big Bang Theory Season 7, Episode 16

the DYNAMIC world
of vexillology.
The Big Bang Theory Season 5, Episode 14

All right, the Three Musketeers
just became the Dynamic Duo.
The Big Bang Theory Season 2, Episode 20

the DYNAMIC world
of vexillology.
The Big Bang Theory Season 5, Episode 14