Questions & Answers about Kuka ei ole nuori?
Why do we use ei here instead of another negative verb like en or et?
The question word kuka (who) is treated as a third-person singular subject, just like hän (he/she). Because of this, it takes the third-person singular negative verb ei.
Why is the word ole used instead of on?
To make the verb olla (to be) negative, Finnish pairs a negative verb (like ei) with the special form ole. You cannot say ei on. The form ole stays exactly the same no matter who the subject is; only the negative verb changes.
Does the adjective nuori change its ending because the sentence is negative?
No, making the sentence negative does not affect the adjective in this case. Since we are asking about a single unknown person (kuka), nuori stays in its basic dictionary form.
Is the word order always Question Word + Negative Verb + ole?
Yes, in questions starting with kuka (who), the word order usually acts just like a regular statement. It goes Subject (Kuka) + Negative Verb (ei) + Main Verb (ole) + Adjective (nuori).