John 6:42

καὶ ἔλεγον· οὐχ οὗτός ἐστιν Ἰησοῦς ὁ υἱὸς Ἰωσήφ, οὗ ἡμεῖς οἴδαμεν τὸν πατέρα καὶ τὴν μητέρα; πῶς νῦν λέγει οὗτος, ὅτι ἐκ τοῦ οὐρανοῦ καταβέβηκα;

Rough Word-by-word:
and they were saying, "Not this is Jesus the son [of] Joseph, whom we we know the father and the mother? How now he says this, that from the heaven I have come down?"

Smooth Translation:
And they were saying, "Is not this Jesus the son of Joseph, of whom we ourselves know the father and mother? How now does he say this, that 'From heaven I have come down?'"

καὶ conjunction "and

ἔλεγον verb imperfect active indicative 3rd plural from λέγω (I say) "they were saying"

οὐχ adverb of negation "not"

οὗτός near demonstrative pronoun nominative singular masculine "this"

ἐστιν verb present indicative 3rd singular from εἰμί (I am) "he is"

Ἰησοῦς proper noun nominative singular masculine "Jesus"

ὁ definite article nominative singular masculine "the"

υἱὸς noun nominative singular masculine "son"

Ἰωσήφ proper noun genitive singular masculine "[of] Joseph"

οὗ relative pronoun genitive singular masculine "whom"

ἡμεῖς pronoun nominative 1st plural "we" (used for emphasis here)

οἴδαμεν verb perfect active indicative 1st plural from εἴδω (I know) "we know"

τὸν definite article accusative singular masculine "the"

πατέρα noun accusative singular masculine "father"

καὶ conjunction "and"

τὴν definite article accusative singular feminine "the"

μητέρα noun accusative singular feminine "mother"

πῶς adverb "how"

νῦν adverb "now"

λέγει verb present active indicative 3rd singular from λέγω (I say) "he says"

οὗτος demonstrative pronoun nominative singular masculine "this"

ὅτι conjunction "that, because"

ἐκ genitive preposition "from, out of"

τοῦ definite article genitive singular masculine "the"

οὐρανοῦ noun genitive singular masculine "heaven"

καταβέβηκα verb perfect active indicative 1st singular from καταβαίνω (I come down) "I have come down"