Learn Swedish: Ja, skolan är stor. - Yes, the school is big.

To make a Yes/No question in Swedish, you simply swap the subject and the verb. Instead of the statement order skolan är (the school is), you move the verb to the very front: Är skolan stor? (Is the school big?).

Why is it skolan instead of just skola?

Skola means "school" or "a school", but adding the -n at the end makes it "the school". In Swedish, the word for "the" attaches to the end of the noun. Because en skola is an en-word, its definite form becomes skolan.

Why do we use stor instead of stort or stora?

Adjectives must match the noun they describe. Since skola is an en-word and it is singular (just one school), we use the base form stor. If we were describing an ett-word like ett hus (a house), we would add a -t and use stort.

Does starting the sentence with Ja change the word order?

No, it doesn't. Words like ja (yes) and nej (no) sit outside the main sentence and are separated by a comma. The actual sentence starts with skolan in position one, which is why the verb är stays in its normal spot at position two.