Learn Hardcore Polish: Warzywa są tańsze rano, dlatego idziemy na rynek wcześniej. - Vegetables are cheaper in the morning, therefore we go to the market earlier.

Tańsze is the comparative form of the adjective tani, meaning “cheaper.” It agrees with warzywa (vegetables), which is plural and in the nominative case, so you use the plural-nominative comparative ending -sze.

Why is warzywa in the plural, and what would the singular be?

Warzywa is the plural form of warzywo (“vegetable”). In Polish, when talking about vegetables in general you normally use the plural. The singular warzywo is used only when you refer to one specific vegetable.

What is rano here? Is it a noun or an adverb, and does it decline?

Rano is an adverb meaning “in the morning.” It does not decline (you don’t change its form for case, gender, or number), and it can appear in different positions in the sentence.

Why does the sentence use dlatego instead of dlaczego? What’s the difference?

Dlatego means “therefore” or “that’s why” and introduces a result or conclusion. Dlaczego means “why” and is used to ask a question. Here we need to express cause and effect, so we use dlatego.

What case and role does have, and why?