"Αυτός φέρνει το ποτήρι."

[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