***** NOT A TEACHER *****
Hello, Odessa Dawn:
May I add my two bits to all the excellent answers that you have already received?
I am probably wrong, but are you referring to something like this:
Principal / Head Teacher (speaking to six teachers): We have decided to start an English class on Saturdays for students who want extra help.
We do not have any funds to pay you, so we are looking for volunteers. Would any of you like to help out?
Mr. Washington: Absolutely. Sign me up.
Mrs. Adams: Me, too.
Mr. Jefferson: You can count on me!
Odessa Dawn: You definitely can include me in!
Ms. Madison: That goes for me, too!
Mr. Monroe: Include me out! No pay, no work!