"Αυτός φέρνει το ποτήρι."

Translation: He brings the glass.

[Moira182786]

So does a neuter noun not change its ending in the accusative ever, or are there exceptions?

[troll1995]

Neuter nouns' accusative is the same as their nominative since Ancient Greek.

[Lng52-._]

Could you use "γυαλί" (instead of "ποτήρι")?

[troll1995]

If you are too cool for school ;) It's slangy.

[Dimitra956826]

That's true. When you say "γυαλί" you refer to the actual material rather than the object. xD

[Sevinci35]

Δυστυχώς όχι

[TEC909481]

Why not τον ποτήρι?

[Ida761526]

Ποτήρι is neutral and it takes το in accusative case.