Questions & Answers about Tarvitsemme arvion viikoksi.
Why is viikko in the translative case (viikoksi)?
The translative ending -ksi is used here to express an intended duration. Saying viikoksi means that the estimate is meant to cover a period of one week, or will be valid "for a week".
Could viikoksi also mean we need the estimate by a certain time?
Yes, the translative is also used for deadlines! However, when using a plain time span like viikoksi (for a week) or vuodeksi (for a year), it usually means intended duration. To express a deadline, you'd typically use it with a specific point in time, like ensi viikoksi (by next week) or perjantaiksi (by Friday).
How would the sentence change if we needed the estimate "within a week"?
To express the time frame in which an action must be completed, you use the inessive case (-ssa/-ssä). So, "We need the estimate within a week" would be Tarvitsemme arvion viikossa.
Why is the object arvion instead of the partitive arviota?
The verb tarvita (to need) often tricks learners! Even though needing something feels like an ongoing state, it takes a standard "total object" when you need a whole, countable thing. Since we need one complete estimate in an affirmative sentence, arvio gets the accusative -n ending. If the sentence were negative, it would take the partitive: Emme tarvitse arviota.
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