"To dziecko jest duże."

Translation: This child is big.

[phgao]

Big as a euphemism for fat? Would a Pole say this sentence or it's just merely a test of concepts for us learners? :)

[Vengir]

It's a normal Polish sentence. Here we call children small or big to refer to their age (or perhaps some other trait associated with it, like heigth or skills).

[phgao]

Thank you

[XanderBoak]

I put "this child is gargantuan, however despite my overwhelmingly obvious exaggeration, the simultaneous sarcasm distributed sill reconciled my answer as incorrect, I yam veryy confused.

[Vengir]

The word you were trying to use is equivalent to Polish „gargantuiczne”.

[KesGrelly]

so I've learned here that this child is neither tall nor fat but big?

[Jellei]

Yup, exactly.

[TeaKozlows]

So, could I say, "To jest duże dziecko" to say "This is a big child" or is that grammatically incorrect?

[Vengir]

That is absolutely correct.

[transientu]

is duze in the accusative or nominative here? I feel like it should be nominative but the help list accusative first. Are they just the same word?

[Jellei]

The forms are identical, as "dziecko" is neuter. The hints aren't that great to always put the right one first.

It's Nominative, because in an "X is Y" sentence, if Y is just an adjective, it's Nominative. And if it's a noun phrase, it's Instrumental.

[Arnoldpitt]

I am confused about the double use of to. a sentence or two before to was used for that is Here you use both to and jest.

[Jellei]

In an "X is Y" sentence, you can only use the "to" construction, if both X and Y are noun phrases. As here Y is just an adjective, you can only go with "jest".

You may think about "to" as something kinda similar to "=". Let's say that one can imagine "this child = a big child", but not really "this child = big".

As for the first (or rather here: the only one) use of "to", it's a neuter determiner. Better to think about it as a completely different word that just happens to look identical.