perustuisi

Perustuisi is a Finnish verb form of the verb perustua, meaning “to be based on” or “to be founded on.” It belongs to the conditional mood, a verb form used to express hypothetical or contingent situations. In usage, perustuisi typically appears in subordinate clauses that discuss what would form the basis of something.

Form and usage notes

The form reflects a hypothetical basis rather than a statement of fact. It can be used to discuss proposals, arguments, or plans that would rely on certain premises. Finnish conditional forms vary by person, number, and subject, and perustuisi is one of the standard ways to express a hypothetical basis in third-person singular contexts, with corresponding forms for other persons (for example, different endings would appear if the subject changed).

Example

Se perustuisi siihen, mitä sanoit. — It would be based on what you said.

Etymology and related terms

The verb perustua derives from the noun perusta, meaning “base” or “foundation.” Related words include peruste (basis, justification) and perustelu (justification or argument). The conditional form perustuisi contrasts with the present indicative perustuu/perustuu, which means “is based on” or “is founded on,” used for factual statements rather than hypotheticals.

See also

Finnish verb mood and tense basics; perustua; perusta; peruste; perustelu.