John 1:21

Καὶ ἠρώτησαν αὐτόν, Τί οὖν; Ἠλίας εἶ σύ; Καὶ λέγει, Οὐκ εἰμί. Ὁ προφήτης εἶ σύ; Καὶ ἀπεκρίθη, Οὔ.

RBT Greek Interlinear:

Strongs 2532; Kai; Καὶ; And; Conj

Strongs 2065; ērōtēsan; ἠρώτησαν; they asked; V-AIA-3P

Strongs 846; auton; αὐτόν; himself; PPro-AM3S

Strongs 5101; Ti; Τί; who; IPro-NNS

Strongs 3767; oun; οὖν; therefore; Conj

Strongs 4771; sy; σὺ; you; PPro-N2S

Strongs 2243; Ēlias; Ἠλίας; Elijah; N-NMS

Strongs 1510; ei; εἶ; you are; V-PIA-2S

Strongs 2532; Kai; Καὶ; And; Conj

Strongs 3004; legei; λέγει; he is speaking; V-PIA-3S

Strongs 3756; Ouk; Οὐκ; not; Adv

Strongs 1510; eimi; εἰμί; I am; V-PIA-1S

Strongs 3588; Ho; Ὁ; the; Art-NMS

Strongs 4396; prophētēs; προφήτης; a prophet; N-NMS

Strongs 1510; ei; εἶ; you are; V-PIA-2S

Strongs 4771; sy; σύ; You; PPro-N2S

Strongs 2532; Kai; Καὶ; And; Conj

Strongs 611; apekrithē; ἀπεκρίθη; separated; V-AIP-3S

Strongs 3756; Ou; Οὔ; No; Adv

RBT Translation:

"No, No"

And they questioned himself, "What about yourself then, are you He Is God ("Elijah")? And he is saying, "Am I not. Are you yourself, the Prophet?" And he separated, "No."^37b

LITV Translation:
And they asked him, What, then? Are you Elijah? And he said, I am not. Are you the Prophet? And he answered, No.

ESV Translation:
And they asked him, “What then? Are you Elijah?” He said, “I am not.” “Are you the Prophet?” And he answered, “No.”

Footnotes

37b

No, No; Yes, Yes

Greek Οὐκ εἰμί, A phrase starting with Οὐκ generally implies a question. "Am I not?" For example, 1 Corinthians 3:16, 6:15, etc, Οὐκ οἴδατε "do you not know/see?"

Greek Ὁ προφήτης εἶ σύ (Ho prophētēs ei sy) translates literally to "The Prophet you are being yourself."

Greek Καὶ ἀπεκρίθη oὔ. And he separated 'no'. ἀπεκρίθη is a passive aorist meaning to separate, set apart. Οὔ is a particle of negation. This form is found around 700 times, the vast majority of times it negates—"not".