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.

You ought to come with us SOMETIME.
The Big Bang Theory Season 2, Episode 16

...maybe SOMETIME you and I
could go see monkeys together.
The Big Bang Theory Season 2, Episode 13

Gonna get me out of here
SOMETIME today?
Breaking Bad Season 3, Episode 11

"to get coffee SOMETIME.
The Big Bang Theory Season 5, Episode 10

Maybe we could enter
a couple of "Halo" tournaments SOMETIME.
The Big Bang Theory Season 1, Episode 7