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.

You know, not everyone needs
to have kids to be FULFILLED.
The Big Bang Theory Season 12, Episode 3

I am. You FULFILLED your oath to
Catelyn Stark against all odds.
Game of Thrones Season 6, Episode 8