Questions & Answers about Minä seisoin lasioven takana.
Why is the first part of lasioven just lasi (nominative) instead of lasin (genitive)?
In compound nouns, if the first word describes the material something is made of or its fundamental type, it stays in the nominative case. So we use lasi (glass) plus ovi (door) to make the base word lasiovi, rather than using the genitive for the first element.
If the postposition takana requires the genitive case, why doesn't the whole compound word become lasinoven?
When you inflect a compound noun in Finnish, only the final word changes its case. The first part, lasi, stays frozen in its original form (which is nominative here, because it describes the material). Only ovi takes the genitive ending to become oven, giving us the final word lasioven.
Why does ovi change to ove- before adding the genitive -n?
Ovi is an older, native Finnish word ending in -i. For these older words, the final -i usually changes to an -e- when you add grammatical endings. This gives us the stem ove- and the genitive form oven. This is different from newer loanwords like lasi, where the -i stays unchanged.
Why do we use the static location form takana here instead of taakse?