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.

Well, I didn't even get
to the dirty part YET.
The Big Bang Theory Season 11, Episode 11

- Has she come YET?
- Who?
Game of Thrones Season 7, Episode 1

and YET we're
fighting to live.
Westworld Season 2, Episode 3

Not YET. I got one more shot
at that little skid mark.
Breaking Bad Season 2, Episode 3

YET, here we are.
The Big Bang Theory Season 11, Episode 17