The present is made by adding the personal endings directly to the verb-stem, which is a root. This verb-stem may be used in its pure form or it may be reduplicated.
a. Some verbs of this class with no active have a verb-stem of more than one syllable (usually two syllables).
Herbert Weir Smyth [n.d.], A Greek Grammar for Colleges; Machine readable text [info] [word count] [Smyth].