Luke 20:13

What shall I do? (Ti poihsw;). Deliberative future indicative or aorist subjunctive (same form). This detail only in Luke. Note the variations in all three Gospels. All three have "will reverence" (entraphsontai) for which see Matthew and Mark. It may be (isw). Perhaps, from iso, equal. Old adverb, but only here in the N.T.