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.

Have you ever seen anything
so FULL of splendor?
Westworld Season 2, Episode 2

...and then I'll return the others
for a FULL refund.
The Big Bang Theory Season 2, Episode 11

Anyone with a chest FULL of gold
can buy an army of Unsullied.
Game of Thrones Season 5, Episode 1

Yes. You and Dr. Fowler
have my FULL support.
The Big Bang Theory Season 12, Episode 13

the machines working at FULL capacity
making banknotes
Money Heist Season 1, Episode 10