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Questions & Answers about Nuoruus on ihanaa.
Why is ihanaa in the partitive case instead of the nominative ihana?
This is the core rule for abstract concepts! The subject here is nuoruus (youth), which is an abstract noun. In Finnish, when the subject is an abstract noun or an uncountable mass noun (like water, air, or time), the adjective describing it (the subject complement) must be in the partitive case. That's why we use ihanaa.
How is the word nuoruus formed?
It is derived from the adjective nuori (young). By adding the suffix -uus (or -yys, depending on vowel harmony), you turn an adjective into an abstract noun. It works exactly like adding "-ness" or "-th" in English to get "youth" from "young", or "happiness" from "happy".
Would it be completely wrong to say Nuoruus on ihana?
People would understand you perfectly, but it sounds grammatically incorrect to a Finnish speaker. Using the nominative ihana tells the listener that the subject is a single, concrete, countable thing. You use the nominative for sentences like tämä laukku on ihana (this bag is wonderful), because a bag is a concrete object you can touch.
Do all nouns ending in -uus require this partitive structure?