08813 Participle

1) The participle represents an action or condition in its unbroken
   continuity, and corresponds to the English verb, "to be" with the
   present participle. It may be used of present, past or future time.

   1a) present time
       what are you doing
   1b) past time
       "he was still speaking" when another came
   1c) future time
       we are destroying - e.g. are about to destroy