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.

Maybe instead of introducing
ourselves to Anu,
The Big Bang Theory Season 12, Episode 4

Well, MAYBE not,
but someday we actually will be old
The Big Bang Theory Season 9, Episode 15

Sheldon, MAYBE you
don't know what to do
The Big Bang Theory Season 12, Episode 19

Maybe I know a whole new market.
Breaking Bad Season 3, Episode 9

Maybe a day or so later,
MAYBE a week, a year,
Breaking Bad Season 5, Episode 16