Answer:
What common verb becomes its own past tense by rearranging its letters?
Without a bridle, or a saddle, across a thing I ride a-straddle. And those I ride, by help of me, though almost blind, are made to see.
Through its wounds, water does run. It once held many but now has none. What is it?
What lies in a tunnel of darkness. That can only attack when pulled back?
I am the greatest teacher out of them all, but alas in the end I kill my pupils.
What is always coming but never arrives?