Breakdown of Minun täytyy lykätä määräaika perjantaiksi.
minä
I
täytyä
to have to
perjantai
Friday
lykätä
to postpone
Questions & Answers about Minun täytyy lykätä määräaika perjantaiksi.
Why use the translative ending in perjantaiksi instead of the illative perjantaihin?
This is a classic use of the translative case (-ksi) for deadlines and scheduling. When you schedule, book, or postpone an event for a specific time, you use the translative. If you used the illative (perjantaihin), it would mean "until Friday"—implying the physical action of postponing is going to take you continuously until Friday to finish.
Why is the object määräaika in the basic nominative form instead of the genitive määräajan?
This is a special rule for necessity sentences. In a normal sentence, a whole object usually takes the genitive-looking ending (-n). However, when the main verb is a necessity verb like täytyy, pitää, or kannattaa, its total object always stays in the basic nominative form.
Why is the word for "I" in the genitive case (Minun) here?
The necessity verb täytyy does not take a normal subject. It always requires the person who "has to" do something to be in the genitive case. The Finnish phrasing literally works more like "Of me it is necessary."
What verb type is lykätä, and how does it behave when conjugated?