Breakdown of Dokument szefowej jest na biurku.
być
to be
na
on, at / to (motion toward) / for (a meal) / for (waiting for)
biurko
desk
dokument
document
Questions & Answers about Dokument szefowej jest na biurku.
Why does the word for 'female boss' end in '-ej' (szefowej)?
It is in the Genitive case to show possession ('the boss's document'). The dictionary form is szefowa. Even though it is a noun, words describing people that end in -owa change their endings like adjectives. For feminine adjectives, the Genitive ending is -ej.
How would I ask 'Whose document is this?' using this sentence's vocabulary?
You would ask Czyj to jest dokument? Because the word dokument is a masculine noun, you must use the masculine form of the question word 'whose', which is czyj. If the noun were feminine, you would use czyja.
Can I change the word order to Szefowej dokument... to match the English 'The boss's document'?
It is technically understandable, but sounds unnatural. In Polish, the 'owner' (the word in the Genitive case) almost always comes after the thing being owned. So, dokument szefowej is the correct and natural way to say it.
Why is it na biurku instead of na biurko?
The dictionary form for 'desk' is biurko. Because we are describing a static location (where something is currently resting), the preposition na ('on') requires the Locative case. For most neuter nouns like biurko, this means changing the final -o to -u, giving us na biurku.