Breakdown of Har du köpt månadskortet ännu?
du
you (singular)
köpa
to buy
ha
to have
ännu
yet / even (with comparative)
Questions & Answers about Har du köpt månadskortet ännu?
Why is there an "s" in the middle of månadskortet?
This is a compound word made of månad (month) and kortet (the card or pass). In Swedish, when joining two nouns, an s is often added in between them to link them together.
Why is it månadskortet and not just månadskort?
Månadskortet is the definite form ("the monthly pass"), ending in -et because kort is an ett-word. Swedish uses the definite form here because the speaker and listener both know exactly which specific pass they are talking about (likely their regular public transit pass).
Could I use redan instead of ännu at the end of this sentence?
You could, but it changes the tone. Ännu means "yet" and is used when you expect something to happen but aren't sure if it has. Redan means "already" and is used if you are surprised it happened so quickly, as in "Have you bought the monthly pass already?"
Is ännu acting as a conjunctive adverb that affects word order here?
Not in this sentence! Here, ännu is just a regular time adverb meaning "yet" and sits safely at the end of the phrase. The sentence starts directly with the verb (Har) simply because it is a yes/no question, which always requires verb-first (V1) word order.