Do you talk CASUALLY with your boss or teachers or you have to be formal?

I had a very fun supervisor at my last job. She was so funny! Because she was so comfortable and casual, we could be that way, too.

Somewhere in between which depends largely on their personality.

I generally talk casually with everyone.

Casual out the wazoo...sir.

depends on the dynamic and personalties of both people and of course the context