Breakdown of Czy to ten produkt, który wolisz?
to
this
czy
[question particle]
ten
this (m)
który
which, who (relative)
Questions & Answers about Czy to ten produkt, który wolisz?
Why do we use ten here if we already have to at the beginning?
The verb wolisz (you prefer) usually takes an Accusative object. Where is it here?
The relative pronoun który (which/that) acts as the direct object for wolisz. Because produkt is a masculine inanimate noun, its Accusative form is identical to its Nominative form. Therefore, który is technically in the Accusative case here, even though it looks just like the dictionary form.
How do we know to use który instead of która or które?
Can I drop który and just say Czy to ten produkt wolisz?, like we often drop 'that' in English?
No, in Polish you cannot skip the relative pronoun. While in English you can say 'Is this the product you prefer?' without 'that', in Polish you must always include który to connect the two parts of the sentence.