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.

God, we're never gonna FINISH in time.
The Big Bang Theory Season 2, Episode 18

Look, I didn't FINISH college,
so I thought I would give it a try.
The Big Bang Theory Season 6, Episode 6

Yeah, while we FINISH soldering
these boards,
The Big Bang Theory Season 9, Episode 19

- Why don't we FINISH this section first?
- Oh, okay.
The Big Bang Theory Season 1, Episode 5

Shh, let him FINISH.
The Big Bang Theory Season 9, Episode 13