Verbs of separating and depending (-sta/-stä)

Verbs of Separating and Distinguishing

The elative case (-sta / -stä) is typically known as the "out of" case. However, it is also grammatically required by certain verbs that involve separating things, drawing a distinction, or relying on something.

For instance, the verb erottaa (to distinguish / to tell apart) requires the thing you are comparing against to be in the elative case.

It is difficult to distinguish a genuine painting from a forgery.
On vaikeaa erottaa aito taulu väärennöksestä.

Another common verb requiring the elative is riippua (to depend on). While English uses "on", Finnish uses the "out of" case to express what a situation stems from.

This is probably original, but that depends on the expert.
Tämä taitaa olla alkuperäinen, mutta se riippuu asiantuntijasta.

Standing Out and Consisting Of

The related verb erottua (to stand out) uses the same logic as erottaa: you stand out from the background or from a copy.

A genuine gem stands out from a copy immediately.
Aito jalokivi erottuu heti kopiosta.

Similarly, when describing what something is made of, use koostua (to consist) combined with the elative.

The whole scam consists only of lies.
Koko huijaus koostuu vain valheista.

Being Mistaken and Benefiting

The "out of" logic extends to being separated from the truth or drawing an advantage out of a situation.

When you are mistaken about something, Finnish uses erehtyä + elative. When you benefit from something, use hyötyä + elative.

An expert is never mistaken about an original work.
Asiantuntija ei koskaan erehdy alkuperäisestä teoksesta.
The criminal probably benefits from this scam.
Rikollinen taitaa hyötyä tästä huijauksesta.
We benefit from the fact that the genuine product stands out from the forgery.
Me hyödymme siitä, että aito tuote erottuu väärennöksestä.