Would you volunteer for this group again?
For the time you spent, how much of an impact did you feel your work or activity had?
Did the organization use your time wisely?
Would you recommend this group to a friend?
When was your last experience with this nonprofit?
Did your volunteer experience have an effect on you? (teaching you a new skill, or introducing new friends, etc.)
It helped me personally with the English language and also taught me to adapt my speech to a specific audience.
How did this volunteer experience make you feel?