Questions & Answers about Miksi kurssin täytyy olla vaikea?
Does adding miksi change the word order of the rest of the sentence?
No. Unlike English, where we often swap words around for a question ('The course must...' becomes 'Why must the course...?'), Finnish keeps the exact same word order as a normal statement. You just put miksi (why) at the very front.
Why is the word for course kurssin instead of the basic form kurssi?
This happens because of the verb täytyy (must). In Finnish, verbs of necessity require their subject (the person or thing that 'must' do something) to take the genitive case. This usually means adding an -n to the end of the word.
Does the verb täytyy ever change its ending to match the subject?
No, it doesn't! Täytyy is a special type of verb that always freezes in this exact third-person form. Instead of changing the verb ending to match who is doing the action (like adding -n for 'I' or -t for 'you'), Finnish changes the subject to the genitive case, just like we did with kurssin.
Since kurssin has an -n ending, why doesn't vaikea (difficult) also get an -n?
When using a necessity verb like täytyy, the describing adjective at the end of the sentence stays in its basic dictionary form. It does not copy the -n ending from the subject.