Kattoihin

Kattoihin is the illative plural form of the Finnish noun katto, meaning “the roofs” or, in the sense of movement, “to the roofs.” In Finnish, the illative case marks direction toward or into something, and the plural form kattoihin indicates movement toward or into multiple roofs, or, depending on context, toward the concept of roofs as a category.

Formation and grammar: The form is built from the stem katto- with the illative plural suffix -iin, yielding kattoihin. This follows standard Finnish vowel harmony rules. The meaning depends on context, and katto can also refer to a ceiling, in which case kattoihin would refer to ceilings in plural or to ceilings collectively when the context requires.

Usage notes: Kattoihin is used with verbs of motion or location when referring to multiple roofs. It is one of several illative plural forms in Finnish and appears in descriptive or narrative texts involving buildings, weather related to roofs, or planning that involves several roofs. The precise nuance—whether exterior roofs or interior ceilings—is determined by surrounding words.

Related forms: katto (roof or ceiling); kattoon (illative singular); katot (nominative plural); kattojen (genitive plural). See also Finnish grammar and illative case.