"Who owns the tea?"

Translation: Cé leis an tae?

[Zylbath]

Is it usual to not use a verb in this sentence?

[galaxyrocker]

There is an implied copulation with the cé which serves as the verb. The answer would be Is liomsa or Ní liomsa assuming you owned or didn't own the tra.

[vanoosamaroo]

How would we know when to use leis vs. ag? To own something is to be with it in Irish, but to have something is for it to be at you?

[SatharnPHL]

It really isn't helpful to think of leis as "with it" in this case, any more than it is to think of ag as "at" in tá tae agam.

Is liomsa an tae can be translated as "the tea is mine" or "I own the tea". Tá an tae agam means "I have the tea". There really isn't any confusion between the two, in either Irish or English.

[GaryOBrien13]

So if I wanted to ask "who owns this tea?" would it be "cé leis tae seo" ?

[SatharnPHL]

Cé leis an tae seo?

[GaryOBrien13]

You keep the "an". Grand.
I assume it's "Cé leis an tae sin" then for that tea?

[SatharnPHL]

Exactly. To say "this (thing)" or "that (thing)" you need to use a definite article - an (rud) seo or an (rud) sin.

[GaryOBrien13]

Great, thanks very much.

[Alexander805162]

I accidentally put 'Cé leis anté' and was marked correct. Is Duolingo wrong, or did I just accidentally say it in a different dialect or something?

[SatharnPHL]

Duolingo was wrong to have been so lenient - "anté" isn't a word in any dialect of Irish.