Questions & Answers about Vesi on välttämätöntä.
Why is välttämätöntä in the partitive case instead of the basic nominative form?
Because the subject of the sentence, vesi (water), is a mass noun. A mass noun is an uncountable substance. In Finnish, when you describe a mass noun using the verb olla, the describing adjective must be in the partitive case.
Would we still use the partitive if the subject was a countable thing, like a book?
No. If you describe a specific countable noun, the adjective usually matches it in the nominative case. For example, stating that a book is essential would be Kirja on välttämätön. The partitive in this sentence is used specifically because water is an uncountable substance.
Why is the subject vesi in the basic nominative case instead of the partitive?
In a standard descriptive sentence, the subject typically stays in the nominative case, even if it is a mass noun. The special partitive rule for mass nouns here only applies to the adjective describing it at the end of the sentence.
How is the partitive word välttämätöntä formed from the basic adjective välttämätön?
For adjectives ending in -tön or -ton, the partitive singular is formed simply by adding the partitive ending -tä or -ta directly to the basic form. That is why välttämätön becomes välttämätöntä. You do not need to use the word's vowel stem for the partitive here.
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