Questions & Answers about Tällä sankarilla on vahvempi supervoima.
Why does vahva change to vahvempi instead of vahvampi?
When adding the comparative ending -mpi to a two-syllable adjective that ends in -a or -ä, that final vowel changes to an -e-. So, vahva (strong) changes its final -a to -e- and adds -mpi, becoming vahvempi (stronger).
Why is it tällä sankarilla instead of tämä sankarilla?
In Finnish, pointing words like tämä (this) must match the case of the noun they are attached to. Because the sentence uses the 'has' possession structure by putting sankari in the adessive case (-lla), the word tämä must also take the adessive case, becoming tällä.
Why are vahvempi and supervoima in the basic nominative form?
In the Finnish possession structure (-lla/llä on), the thing being possessed acts as the grammatical subject of the sentence. Subjects are normally in the basic nominative form. Since supervoima is nominative, the adjective vahvempi describing it must also be in the nominative.
If the superpower were in a different case, would vahvempi change too?