{If I have spoken evil} (ei kak(9373) elal(8873)a). Condition of
first class (assumed to be true), with ei and aorist active
indicative. Jesus had not spoken evilly towards Annas, though he
did not here turn the other cheek, one may note. For the sake of
argument, Jesus puts it as if he did speak evilly. Then prove it,
that is all. {Bear witness of the evil} (martur(8873)on peri tou
kakou). First aorist active imperative of marture(935c), to
testify. This is the conclusion (apodosis). Jesus is clearly
entitled to proof of such a charge if there is any. {But if well}
(ei de kal(9373)). Supply the same verb elal(8873)a. The same
condition, but with a challenging question as the apodosis.
{Smitest} (dereis). Old verb der(935c), to flay, to skin, to beat,
as in  Mt 21:35  Lu 22:63  2Co 11:20  (of an insulting blow in
the face as here).