Learn Polish: Ten ekran, który tu leży, jest zepsuty. - This screen which is lying here is broken.

The word który is a relative pronoun meaning "which" or "who", and it has to match the gender and number of the noun it replaces. Because it refers back to ekran (screen), which is a masculine singular noun, we must use the masculine singular form który.

Why are there commas before który and after leży?

In Polish, you must always use commas to separate a relative clause (the extra information starting with words like który) from the main sentence. While English sometimes lets you skip these commas, Polish grammar strictly requires them.

Could I use który if I was talking about a person instead of an object?

Yes! Even though it translates to "which" in this sentence about a screen, który is also the standard word for "who" or "that" when describing people in a relative clause.

Why does the sentence use the verb leży (lies) instead of just saying the screen "is" here?

Polish speakers love to be specific about an object's physical position. Instead of just saying something "is" somewhere, it is very natural to specify if it is lying flat (leży), standing up (stoi), or hanging (wisi).

Why is the word for broken spelled instead of ?