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Questions & Answers about Pidätkö uudesta kielestä?
Why are uusi and kieli in the -sta/-stä form here?
The verb pitää (to like) requires the thing you like to be in the elative case, which ends in -sta or -stä. This is called a verb rection. Even though we just say "the new language" in English, Finnish requires these endings because of the verb pitää.
How does the word uusi (new) become uudesta?
Words ending in -si often change their ending to -te- or -de- before adding a case suffix. For uusi, the stem becomes uude-, and then we add the elative ending -sta so it perfectly matches the grammar of the noun it describes.
Why is the word for language kielestä and not "kielistä"?
The word kieli (language) is an older Finnish word ending in -i. For these older words, the final -i changes to an -e- when you add an ending. So the stem is kiele-, and adding the elative ending makes it kielestä.
Why does the verb pitää (to like) change to pidätkö?
First, conjugating pitää for "you" (sinä) triggers consonant gradation, changing the strong t to a weak d to make pidät (you like). Then, to turn it into a yes/no question, we attach the question clitic -kö to the very end of the verb.