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.

I mean, OTHERWISE,
you look like shit, but--
Breaking Bad Season 5, Episode 16

physical or OTHERWISE,
The Big Bang Theory Season 5, Episode 10

That's discrimination
against the OTHERWISE located.
The Big Bang Theory Season 4, Episode 2

Otherwise, they're not...
Game of Thrones Season 5, Episode 5

boon or OTHERWISE.
The Big Bang Theory Season 5, Episode 15