why
From LSJ
τίς δ' οἶδεν εἰ τὸ ζῆν μέν ἐστι κατθανεῖν, τὸ κατθανεῖν δὲ ζῆν κάτω νομίζεται → who knows if life is death, and if in the underworld death is considered life
English > Greek (Woodhouse)
adverb
Interrogative: P. and V. τί, τοῦ χάριν (Dem. 490). P. διὰ τί, τοῦ ἕνεκα (Dem. 1104), ἀντὶ τίνος (Plato, Lysis 208E), V. πρὸς τί, ἀντὶ τοῦ, εἰς τί, τί χρῆμα, τίνος ἕκατι, ἐκ τοῦ (Eur., Electra 246), τίνος χάριν.
for what purpose: P. and V. ἐπὶ τῷ (Soph., Ajax 797).