Questions & Answers about Musimy pójść do kasy i kupić bilety.
Why use the perfective verb pójść here instead of the regular iść?
Pójść is created by adding the prefix po- to iść (to go on foot), making it a perfective verb. This means it describes a completed, one-time action. We aren't talking about the ongoing process of walking, but rather the completed trip of getting to the ticket office.
Why is the word for ticket office kasy instead of kasa?
The preposition do (to/into) always forces the following noun into the Genitive case. For a feminine noun ending in -a like kasa, the Genitive ending is -y, making it do kasy.
Both pójść and kupić are perfective verbs. Is there a reason they match?
Yes! They describe a logical sequence of one-time, completed goals: first we complete the trip to the ticket office (pójść), and then we complete the purchase (kupić). When listing consecutive actions you want to get done, Polish naturally uses a chain of perfective verbs.
What case is bilety in?
It is in the Accusative case because it is the direct object (the thing being bought). For inanimate masculine nouns like bilet (ticket), the plural Accusative looks exactly like the plural Nominative, ending in -y.