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.

Your accomplishment
was IMPRESSIVE.
The Big Bang Theory Season 5, Episode 12

That's an IMPRESSIVE layout, isn't it?
The Big Bang Theory Season 6, Episode 21

Very IMPRESSIVE.
The Big Bang Theory Season 2, Episode 13

Wow, that's very IMPRESSIVE.
The Big Bang Theory Season 4, Episode 22

lt's IMPRESSIVE.
Breaking Bad Season 4, Episode 3