A.T. Robertson Commentary Luke 20:13

"And the lord of the vineyard said, What shall I do? I will send my beloved son; it may be they will reverence him." — Luke 20:13 (ASV)

What shall I do? (Τ ποιησω; ). 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" (εντραπησοντα) for which see Matthew and Mark.

It may be (ισως). Perhaps, from ισος, equal. Old adverb, but only here in the N.T.