Questions & Answers about Onko pöydän muoto ympyrä vai neliö?
Why is the word for "or" vai here instead of tai?
In Finnish, vai is used specifically in questions when you are asking the listener to choose between two mutually exclusive options, like "a circle OR a square". The word tai is used in statements, or in questions where you are just offering open possibilities rather than forcing a strict choice.
Why is pöytä (table) written as pöydän?
It is in the genitive (possessive) case because we are talking about "the table's shape" (pöydän muoto). Adding the -n ending to pöytä triggers consonant gradation, which softens the strong t into a weak d.
Why are the shapes ympyrä and neliö in the basic nominative case, rather than the partitive?
In a basic "A is B" sentence where you are defining a complete, countable thing, the describing word stays in the nominative case. Because a "shape" (muoto) is a distinct, countable concept here rather than an uncountable mass, the shapes take the basic form.
Why does the sentence start with Onko instead of just On?