Questions & Answers about Tämä on mahtava saavutus.
How is the noun saavutus built from a verb?
It comes from the verb saavuttaa (to achieve). To form the noun, you take the weak verb stem saavuta-, drop the final vowel, and add the -us suffix. This specific suffix is used to turn an action into the tangible result of that action, which perfectly describes an achievement.
Why does the verb saavuttaa have a double T, but the noun saavutus only has one?
This is due to consonant gradation. When forming an -us noun from verbs that end in -ttaa, you build it on the weak stem. The strong tt in the infinitive saavuttaa weakens to a single t in the stem saavuta- before the ending is attached.
Why isn't the partitive case used for mahtava saavutus here?
In Finnish, in a basic "A is B" sentence like this one, the subject complement (the word describing what the subject is) stays in the nominative case if it is a single, countable thing. Since an achievement is countable, both the adjective mahtava and the noun saavutus take the basic nominative form.
What kind of "great" does mahtava mean in this context?
While it translates to "great" here, mahtava carries a strong sense of "awesome," "huge," or "magnificent." It comes from the noun mahti (might or power), so it feels much stronger and more expressive than a basic word for good like hyvä.