Learn Finnish: Meneekö bussi kaupunkiin? - Does the bus go to the city?

The ending -kö is a question marker that creates a yes/no question. The verb is menee (it goes), and adding -kö flips the meaning to "does it go?".

Why is the question ending -kö and not -ko?

This happens because of vowel harmony. The dictionary form of the verb is mennä, which contains the front vowel ä. Words with front vowels take the front-vowel ending -kö instead of the back-vowel ending -ko.

Does the word order change when making this a question?

Yes! In Finnish, yes/no questions start with the word that has the -ko or -kö ending attached to it. Because we are asking about the action of going, the verb meneekö must come first.

Why is kaupunki (city) written as kaupunkiin?

This uses a form called the illative case, which means "into" or "to" a place. For many words ending in a short vowel like kaupunki, you form it by simply doubling that final vowel and adding -n, resulting in kaupunkiin.