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.

Lord Stark's LUCKY he still has a head.
Game of Thrones Season 1, Episode 5

You're a LUCKY man, Leonard.
The Big Bang Theory Season 1, Episode 5

You're LUCKY.
With me, it's usually the other way around.
The Big Bang Theory Season 2, Episode 10

Let's say we get LUCKY.
l mean, incredibly LUCKY,
Breaking Bad Season 4, Episode 7

If I'm LUCKY, month from now,
best-case scenario,
Breaking Bad Season 5, Episode 15