Question 1

What does "of course" mean?

Accepted Answer

Used to say yes or agree in a way that shows something is obvious.

Question 2

How do you use "of course" in a sentence?

Accepted Answer

Of course you can borrow my pen.

Question 3

Is "of course" formal or informal?

Accepted Answer

"of course" is register-neutral — appropriate in both casual and formal contexts. Very frequent in polite conversation to confirm or give permission.