Learn Swedish: Nya fakta bekräftar teorin. - New facts confirm the theory.

Fakta is the irregular plural of the Latin-derived neuter noun ett faktum (a fact). Instead of following normal Swedish plural rules, words ending in -um often drop the -um and add -a in the plural.

Why do we use nya here instead of ny or nytt?

Because fakta is plural, the adjective must also take its plural form, which adds an -a. If we were talking about a single fact, we would use the neuter singular form nytt to say ett nytt faktum.

Does the verb bekräftar change because the subject is plural?

No, and this is a great Swedish shortcut! Verbs never change form to match the number of the subject. Whether it is one fact (ett faktum bekräftar) or many facts (fakta bekräftar), the verb stays exactly the same.

Why does teorin end with an -n?

This is the singular definite form, meaning 'the theory'. The base word is en teori. For most en words that already end in a vowel, you simply attach an -n to the end to say 'the'.