Question 1: when used with feminine or masculine nouns that describe objects, would the neuter demonstrative pronoun αυτό be possible, or does it have to be the feminine/masculine? (I am asking because in Spanish the neutral pronoun "esto es un/una ..." would be possible in case the object is unknown, i.e. to answer the question ¿Qué es esto?)
And question 2: referring to people, one would very likely stay with the gender of the noun if it is feminine or masculine, but what if the noun is neuter, as in "this is a boy"? On Duolingo it was " αυτός είναι ένα αγόρι", thus masculine pronoun with neuter noun. Would " αυτό είναι ένα αγόρι" be possible here alternatively, or is this the only way to phrase it?