Breakdown of Kun me rentoudumme, meidän ei tarvitse tiskata tai murehtia.
me
we
tai
or
ei
no / not (en, et, ei, emme, ette, eivät)
tarvita
to need
kun
when (conjunction)
tiskata
to wash dishes
murehtia
to worry
rentoutua
to relax
Questions & Answers about Kun me rentoudumme, meidän ei tarvitse tiskata tai murehtia.
Why is it meidän ei tarvitse instead of me emme tarvitse?
This is the special structure for expressing necessity (or in this case, non-necessity). When saying you don't need to do something, the person who doesn't need to do it is put in the genitive case (meidän). Then, you use ei tarvitse which stays frozen in the third-person singular, regardless of who the subject is.
Why does the first half of the sentence use a normal subject me instead of meidän?
The first clause (Kun me rentoudumme) is a normal sentence describing an action, so the subject me is in the basic nominative case, and the verb matches it. The genitive subject rule only applies to the specific 'needing to do something' structure in the second half of the sentence.
What verb type is rentoudumme, and why is there a d in it?
The basic verb is rentoutua (to relax), which is a Type 1 verb. When you add the -mme ending for 'we', you close the syllable. This triggers consonant gradation, meaning the strong t in the middle of the word changes to a weak d.
Why are tiskata and murehtia in their dictionary forms?
When you use the genitive + ei tarvitse structure, the action you don't need to do must be in the first infinitive (the basic dictionary form). Since you don't need to wash dishes or worry, both tiskata and murehtia stay in this basic form.
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