σὺ (su) in John 1:25: P-2NS

Noun: in this lexicon labeling, the pronoun is treated as a substantive form that points to a participant in the discourse.

Nominative: the form usually marks the subject or adds emphasis, and here it highlights the person being addressed in the question.

Singular: the form is grammatically singular in this occurrence, so the address is to one person in the scene.

Feminine: this field does not apply to the cited form, so no feminine grammatical class should be inferred for this occurrence.

εἰ

The form stands in the conditional question, where it identifies the one being directly confronted by the speakers.

It functions as an emphasized second-person address, drawing attention to John as the one under inquiry.

It is not itself the condition's action, nor does it name a new referent or add a separate theological claim.

Moderate: The pronoun keeps the authority question aimed directly at John.

Second-person singular nominative pronoun in a conditional question. marks John as the person under inquiry. Attached to the condition asking if John is not the Christ. Governed by the question about why John is baptizing. The form sharpens direct address, but the sequence of titles and the baptism question supply the interpretive content.

Who is the question confronting? It confronts John personally about his identity and authority.

Direct: The pronoun directly supports rendering the question with "you."

The nominative form may add pointedness, but it should not be made to carry the whole authority question.

Case carries theology: Do not derive John's authority or lack of authority from the case form alone.

The witness reads σὺ in John 1:25 within the question, "εἰ σὺ οὐκ εἶ ὁ Χριστός".

The lemma σύ is the common second-person pronoun, here referring to the person being questioned.

Its nominative form can add emphasis, but the context already makes the addressee clear, so the form chiefly sharpens directness.

The question presses John about his identity and authority: if he is not the Christ, Elijah, or the prophet, why is he baptizing?

This fits the larger scene of witness and testimony in John, where identity is tested through direct questioning.

For readers, the form signals pointed address and personal confrontation, not a general statement about people in the abstract.

Do not derive gendered meaning, a change of lemma, or a standalone doctrinal conclusion from the case form alone.