of course 和 sure 的差別在哪裡？如果不好說明，請提供一些例句。

'Of course' sounds more affirmative, like you will really try to do or respond to what is asked.
"Can you pick up my lunch today?" "Of course I can"

In other contexts it can sound like a response to an obvious answer.
"Did you pay the bills?"
"Of course I did!"

'Sure', is a little more relaxed, but still similar.
"Do you want to go to the park?"
"Sure!"

"Could you fill these papers for me?"
"Sure thing"