"He is eating bread."

Translation: On je chleb.

[Bob20020]

Why is there no accusative change here?

[Jellei]

You mean Accusative to Genitive? That happens when the verb is negated (and it's not like literally 100% of verbs). "On nie je chleba" would be Genitive, and here's Accusative.

[mihxal]

He probably meant that Accusative = Nominative. Most masculine inanimate nouns don't change form in Accusative so Accusative = Nominative.

[Bob20020]

I mean that "Chleb" does not change, and this is accusative. "Herbata" becomes "herbatę", so shouldn't "chleb" become something else too?

[mihxal]

I replied that most masculine inanimate nouns don't change form in Accusative so Accusative = Nominative.

[Bob20020]

There are inaminate nouns? Doesn't that mean that only people and animals change?

[mihxal]

Not only, but nouns naming people and animals have Accusative = Genitive.