A verb is a word that does an action, shows a state of being or helps another verb.
So 3 types - first one speaks for itself and yes, you can add 'ing' to the end! So run, jump, eat. To spot a verb, ask yourself "Can I put 'I/he' in front of it?
State of being verbs link to who what or where you are and the full list is:
am, is, are, was, were, be being been
Helping/auxiliary verbs do what it says on the tin - help another verb! I have played - played is your action and have is helping it. I am going - going is the action; am is the helping verb.
Auxiliary verb list is:
am, is, are, was, were, be, being, been
have, has, had
do, does, did
shall, will, should, would, may, might, must
can, could
(So state of being verbs can also be helping verbs!)
They will probably only do action verbs anyway because I have never had a secondary pupil who already knew anything about state of being/helping verbs!