Я приехал сюда в командировку на неделю.

Questions & Answers about Я приехал сюда в командировку на неделю.

Why do we use на неделю instead of just неделю to mean "for a week"?
The preposition на followed by the Accusative case is used specifically to show the intended duration of a trip or the result of an action. You arrived, and the plan is to stay for a week. If you used just the Accusative word неделю without на, it would mean the action of traveling itself took a whole week!
Why does the sentence use сюда instead of здесь for "here"?
Russian makes a strict distinction between location (where you are) and direction (where you are going). Because приехал (arrived/came) is a verb of motion showing movement to a destination, you must use the directional adverb сюда (to here) rather than the static location word здесь (in this place).
Why is the word for business trip in the Accusative case (в командировку)?
When you talk about going somewhere for a specific purpose or event, Russian often uses the preposition в (or на) plus the Accusative case, treating the purpose like a destination. The nominative form is командировка, and because it's the destination/purpose of your motion, the feminine -а ending changes to -у.
Does using the perfective verb приехал tell us anything about where the speaker is right now?
Yes! Because приехал is perfective, it focuses on the result of the action. It implies the speaker arrived and is currently still here on the business trip. If they used the imperfective form приезжал, it would mean a completed round trip: they came for a week, but have already left.

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