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.

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

- So we'd be perpetrating a ruse?
- Precisely.
The Big Bang Theory Season 4, Episode 5

Neither do I, PRECISELY.
Game of Thrones Season 4, Episode 7

...was PRECISELY what you wanted.
Breaking Bad Season 5, Episode 8

More PRECISELY, we used your loofah.
The Big Bang Theory Season 1, Episode 7