#8813 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