Breakdown of Äidin ei tarvitse ostaa laktoositonta jäätelöä.
ei
no / not (negative verb)
ostaa
to buy
jäätelö
ice cream
tarvita
to need
äiti
mother
laktoositon
lactose-free
Questions & Answers about Äidin ei tarvitse ostaa laktoositonta jäätelöä.
How do we get the word laktoositonta?
It starts with the noun laktoosi (lactose). We add the suffix -ton (meaning 'without' or '-less') to make the adjective laktoositon (lactose-free). Finally, because it describes the ice cream, it takes the partitive ending -ta to match jäätelöä.
Why is mother in the genitive case (äidin) instead of the basic form (äiti)?
This sentence uses a necessity structure. When you use verbs like täytyy (must) or tarvita (to need) to say someone has to do something, the person who needs to do the action is put into the genitive case (ending in -n).
Why are the words for 'lactose-free ice cream' in the partitive case (laktoositonta jäätelöä)?
In Finnish, the object of a negative sentence is always in the partitive case. Since mother does not need to buy the ice cream (ei tarvitse ostaa), the object must take partitive endings. (Ice cream is also a mass noun, which often takes the partitive anyway!)
Why is the verb written as tarvitse instead of tarvitsee?
In negative sentences, the main verb drops its personal ending. The positive third-person form is tarvitsee (needs to), so the negative form drops that final lengthened vowel to become ei tarvitse (does not need to).
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