Student or Learner
Does this conditional refer to a future hypothetical one or a past one?
1)I had seen Mikey writing the note at his desk, using his left hand to
change his handwriting. I said nothing. Most parental excuse notes I received in those days were written by my students. They had been forging excuse notes since they learned to write, and if I were to deal with all of them, I would be busy 24 hours a day. I threw Mikey's note into a desk drawer along with dozens of other notes.