Hi Nic, I'm not a teacher, but I would say that what they're asking is "how many verbs are there?" in order to see that you can correctly discriminate which words are verbs. I don't think it's a trick question where modal verbs and normal verbs combine to be one. (Then again, I've never done TEFL so I could be wrong).
I should have given it to you. 3
I wish I could find it. 3