Breakdown of Sinun täytyy perustella päätös, sillä asiakas vaatii sitä.
se
it / he / she (of a person) / that
sinä
you
täytyä
to have to
asiakas
the customer
päätös
decision
vaatia
to claim (demand)
sillä
for / because (coordinating)
perustella
to justify
Questions & Answers about Sinun täytyy perustella päätös, sillä asiakas vaatii sitä.
What is the difference between using sillä and koska in this sentence?
Both translate to "because" or "for". The main difference is grammatical: koska is a subordinating conjunction, while sillä is a coordinating conjunction linking two independent main clauses. In everyday language, sillä sounds a bit more formal or literary, much like using "for" instead of "because" in English. Remember that a comma is always required before sillä.
Why does the sentence start with the genitive Sinun instead of the basic nominative Sinä?
The verb täytyy (must / has to) is a necessive verb. These verbs do not take normal subjects. Instead, the person who has the obligation to do the action is always put in the genitive case.
Normally a total object takes a genitive ending, so why is päätös (decision) in its basic nominative form here?
This is a special rule for necessive sentences! When the main verb expresses obligation (like täytyy, pitää, or on pakko), the total object of the sentence drops its genitive ending and appears in the nominative case. Therefore, it is päätös, not päätöksen.
Why does the sentence end with the partitive sitä rather than sen?
The word sitä (it) refers back to the decision, acting as the object of the verb vaatia (to demand). Vaatia is a partitive verb, meaning the thing being demanded must always be in the partitive case.
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