Ilma viilenee illalla, mutta sauna lämpenee.

Questions & Answers about Ilma viilenee illalla, mutta sauna lämpenee.

How is viilenee formed, and what is its dictionary form?
The dictionary form is viiletä (to cool down), which is a Type 6 verb. To conjugate Type 6 verbs, you drop the -ta/-tä ending and add -ne- to get the stem (viilene-). Then, you add the third-person singular ending, which doubles the last vowel, giving you viilenee.
Why is there an mp in lämpenee when the dictionary form is lämmetä?
Type 6 verbs undergo "reverse consonant gradation." This means the dictionary form has the weak consonant grade (here, mm), but when you build the -ne- stem, it switches to the strong grade (mp). That's why lämmetä becomes the stem lämpene-.
How do you form the negative present and past tenses for these verbs?
For the present negative, use the negative verb with the -ne- stem without any personal endings: ei viilene (does not cool down). For the past negative, add the past participle ending -nnyt/-nneet to the dictionary stem: ei viilennyt (did not cool down).
If I wanted to say "the sauna warmed up" in the past tense, how does the verb change?
It becomes sauna lämpeni. To form the past tense of a Type 6 verb, take the -ne- stem (lämpene-) and replace the final e with the past tense marker i before adding any personal endings.
Why is "in the evening" translated as illalla rather than using the "in" case (-ssa)?
In Finnish, time expressions for parts of the day generally take the adessive case (-lla/-llä) to express "when" something happens. This is a set pattern you also see in aamulla (in the morning) and yöllä (at night). Notice how the lt in ilta weakens to ll when the ending is added.

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