Volunteer firefighters; volunteer tutoring.
An information booth staffed by volunteers; hospital volunteers.
Volunteered their services; volunteer to give blood.
Many retirees volunteer in community service and day care centers.
We were volunteered to do the dishes.
When you go work in a soup kitchen for free, this is an example of a situation where you volunteer.
A person who works in a soup kitchen for free is an example of a volunteer.
To volunteer for doing the dishes.
My sister volunteered me to do the dishes.