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.

Rio, I need you to answer me
as PRECISELY as you can.
Money Heist Season 3, Episode 7

- He fights for Robb Stark.
- Precisely.
Game of Thrones Season 2, Episode 3

PRECISELY where and when
an event of awareness takes place.
The Big Bang Theory Season 10, Episode 19

PRECISELY those are the ones
that could actually try to rise up
Money Heist Season 1, Episode 13

And that is PRECISELY what we are doing.
Game of Thrones Season 5, Episode 9