Lumipallo lensi linnoituksen päälle.

Questions & Answers about Lumipallo lensi linnoituksen päälle.

Why is it päälle instead of päällä here?
Päälle expresses movement to a destination (onto), which fits the action of the verb lensi (flew). If the snowball was already resting on the fortress, you would use the static location form päällä (on top of). The third form in this spatial system is päältä (from on top of).
Why is linnoitus (fortress) in the genitive form linnoituksen?
Most Finnish postpositions, including spatial ones like päälle, require the noun preceding them to be in the genitive case. You can think of it literally as onto the top of the fortress.
What is the rule for adding the genitive ending to a word like linnoitus?
Linnoitus belongs to a very common group of words ending in -us or -ys. For these words, the final -s turns into -kse- before adding most endings. Here, we add the genitive -n, giving us linnoituksen.
What is the dictionary form of lensi, and why does it change so much?
The dictionary form is lentää (to fly). In the past tense, the -t- changes to an -s- before the past tense marker -i. This -t- to -s- change is common in many basic verbs, similar to how huutaa (to shout) becomes huusi or löytää (to find) becomes löysi.

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