Tyttö istuu teltassa.

Breakdown of Tyttö istuu teltassa.

tyttö
girl
istua
to sit
teltta
tent

Questions & Answers about Tyttö istuu teltassa.

Why is it teltassa with one 't' when the dictionary word for tent is teltta?
When we add the "in" ending -ssa to teltta, it closes the syllable right before the ending (making it tel-tas-sa). This triggers consonant gradation. The strong double tt is forced to simplify into a single weak t, giving us teltassa.
If double consonants weaken, why does tyttö get to keep its double 't' here?
Tyttö (girl) is the subject of the sentence, so it is in its basic dictionary form. Consonant gradation usually only happens when we add a grammatical ending (like -ssa) that closes a syllable. Since there is no extra ending attached to tyttö here, its double tt stays strong.
Why does the verb istuu end with a double 'u'?
The basic dictionary form of the verb is istua (to sit). To make the "he/she/it" form, you take the verb stem (istu-) and double its final vowel. Since the stem ends in u, doubling it gives us istuu.
Why is the ending -ssa here instead of -ssä?
This is a reminder of vowel harmony! The base word teltta contains the back vowel a. Even though the first vowel e is neutral and can go with anything, the back vowel a dictates that we must use the matching back vowel ending -ssa.

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