Good News Translation inverts the sentence order in the first part of this verse. In Greek it literally reads “If I had not done the works among them that no one else did, they would not have sin.” Here again the inversion of the sentence order is simply for the sake of attaining a more natural English style. As in verse 22, the phrase “to have sin” is taken by most commentators and translators with the meaning “to be guilty of sin.” For the translational difficulties in the first part of verse 24, see comments on verse 22, which is essentially parallel.

As it is translates the same two particles mentioned in verse 22.

In Greek the verb seen has no object expressed. Good News Translation supplies what I did, referring to the things earlier in the sentence. Jerusalem Bible (“they have seen all this”), Zürcher Bibel, Luther, Die Bibel im heutigen Deutsch, and the alternative reading of New English Bible all follow this exegesis. However, some translations (Moffatt, Goodspeed, New English Bible, Phillips, Revised Standard Version, and La Sainte Bible: Nouvelle version Segond révisée) take both “Jesus” and “my Father” as the objects of the verbs seen and hated. For example, New English Bible has “they have both seen and hated both me and my Father.”

Quoted with permission from Newman, Barclay M. and Nida, Eugene A. A Handbook on the Gospel of John. (UBS Handbook Series). New York: UBS, 1980. For this and other handbooks for translators see here .