Questions & Answers about Tyttö oppi uusia sanoja noidilta.
How do we get the form noidilta from the basic word for witch?
The basic word is noita. To say from the witches in the ablative plural, we need three changes. First, consonant gradation changes the strong t to a weak d. Second, because the word's first vowel is o, the final a drops before the plural i, creating the stem noidi-. Finally, we add the ablative ending -lta to mean from.
Why are uusia sanoja in the partitive plural case here?
They are in the partitive plural because the girl learned an open-ended amount of words. She didn't learn all the new words in a specific list, just some new words in general. The adjective uusi (new) becomes uusia, and sana (word) becomes sanoja.
Why does the word sana change its a to o in the plural (sanoja), but noita drops its a (noidilta)?