Answer:
Teenage girls are pros at creating me. Learn me in classes.
He has married many women, but has never been married. Who is he?
I am taken from a mine and shut in a wooden case from which I am never released. Yet I am used by almost everybody. What am I?
I am the kind of nut that is empty at the center and has no shell.
Why is it so easy to weigh fish?
No matter how little or how much you use me, you change me every month.