Greek

καὶ οὐκ ἔγνωσαν ἕως ἦλθεν ὁ κατακλυσμὸς ἦρεν ἅπαντας οὕτως ἔσται ἡ παρουσία τοῦ Υἱοῦ ἀνθρώπου

Transliterated

kai ouk egnōsan heōs ēlthen ho kataklysmos ēren hapantas houtōs estai hē parousia tou Huiou anthrōpou

Literal English

And not they knew until [that] came - flood took away all thus it will be the coming of the Son of Man
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