μεμαρτύρηκα (memartureka) in John 1:34: Verb First Person Singular Perfect Active Indicative

Verb: the form names an action or state of speaking, here the act of testifying.

Perfect: presents a completed action or state with continuing relevance where the context supports it.

Active: presents the subject as doing or carrying the action.

Indicative: presents the verbal idea as an assertion or statement in the clause.

First person: the speaker or speakers are grammatically involved in the verbal form.

Not applicable: this verb form is not using noun case to mark its sentence role.

Singular: the form is marked for a single speaker, fitting the first person testimony in this verse.

Not applicable: this verb form does not use grammatical gender to make its point.

καὶ

The form is linked with the preceding coordinated testimony, following 'I have seen' and joined to the content introduced by 'that'.

It states the speaker's completed testimony as part of the witness chain in the verse.

It does not by itself identify a separate subject, add a new object, or turn the clause into a different kind of statement.

High: The first-person perfect verb presents John own testimony after he says he has seen.

First-person singular perfect active indicative testimony verb. states John completed witness in direct discourse. Attached to John first-person witness statement. Governed by the coordinated testimony after the statement that he has seen. The perfect form supports the completed-testimony wording, but the confession content comes from the clause that follows.

Whose testimony is being stated? The first-person singular form presents John as speaking of his own testimony.

Direct: The perfect active form directly supports English wording such as "I have testified."

The perfect aspect should not be isolated from the preceding "I have seen" and the testimony content that follows.

Perfect tense proves repeated testimony by itself: The perfect form supports completed testimony wording; the passage supplies the witness content and scope.

The witness text reads 'κἀγὼ ἑώρακα, καὶ μεμαρτύρηκα ὅτι οὗτός ἐστιν ὁ υἱὸς τοῦ Θεοῦ.'

The lemma μαρτυρέω means to testify or bear witness, so the form carries the sense of spoken testimony.

Here the grammar supports an eyewitness claim that has already been made and now stands as declared testimony about Jesus.

The verse communicates that the speaker has seen and now testifies that Jesus is the Son of God.

This fits the passage's larger emphasis on witness, revelation, and public confirmation of Jesus' identity.

In teaching or translation, the form can be rendered as a completed personal testimony, such as 'I have testified' or 'I bear witness.'

Do not infer from the tense alone that the speaker is repeatedly testifying, or that the form changes the meaning of the lemma.