John 12:33

Τοῦτο δὲ ἔλεγε, σημαίνων ποίῳ θανάτῳ ἔμελλεν ἀποθνῄσκειν.

RBT Greek Interlinear:

Strongs 3778; touto; τοῦτο; this one; DPro-ANS

Strongs 1161; de; δὲ; and; Conj

Strongs 2036; elegen; ἔλεγεν; had said; V-IIA-3S

Strongs 4591; sēmainōn; σημαίνων; he who is signifying; V-PPA-NMS

Strongs 4169; poiō; ποίῳ; which; IPro-DMS

Strongs 2288; thanatō; θανάτῳ; death; N-DMS

Strongs 3195; ēmellen; ἤμελλεν; he was destined; V-IIA-3S

Strongs 599; apothnēskein; ἀποθνήσκειν; to die; V-PNA

RBT Hebrew Literal:

And this one he was speaking, he who gives a sign for which death was destined to die away.^97b

Julia Smith Literal 1876 Translation:
This said he, signifying what death he was about to die.

LITV Translation:
But He said this, signifying by what kind of death He was about to die.

ESV Translation:
He said this to show by what kind of death he was going to die.

Footnotes

97b

Greek ποίῳ θανάτῳ ἔμελλεν ἀποθνῄσκειν. 

1. ποίῳ (poiō): This is an interrogative pronoun meaning "what/which/who."

2. θανάτῳ (thanatō): This is the dative masculine singular form of the noun θάνατος (thanatos), meaning "death."

3. ἔμελλεν (emellen): This is the imperfect indicative form of the verb μέλλω (mellō), meaning "to be about to."

4. ἀποθνῄσκειν (apothnēskein): This is the present infinitive form of the verb ἀποθνῄσκω (apothnēskō), meaning "to die."

The rendering "which death he was about to die" is a semantically bizarre phrase. The Greek emphasizes the pronouns so much that it is hard not to notice the intentional absence of one here. Revelation 20:14 speaks of a Death that is "cast away" as well as "death swallowed", etc.