Tomar el metro is the answer.
Yeah, I think it's a novel. Some of my friends had to read it and it looked like a novel to me.
Answer:
Helping verbs, helping verbs, there are 23! Am, is, are, was and were, being, been, and be, Have, has, had, do, does, did, will, would, shall, and should. There are five more helping verbs: may, might, must, can, could!