Breakdown of Wir müssen in irgendeinem staubigen Karton suchen.
in
in
wir
we
suchen
to look for
müssen
to have to, must
Questions & Answers about Wir müssen in irgendeinem staubigen Karton suchen.
Why does irgendein take the -em ending here to become irgendeinem?
It is in the dative case. The two-way preposition in takes the dative here because it describes a fixed location (where you are searching), rather than a movement toward a destination. Since Karton is masculine (der Karton), the indefinite determiner irgendein takes the dative masculine ending -em.
Why doesn't the adjective staubig also get an -em ending? Why is it staubigen?
This happens because of weak adjective declension. The determiner irgendeinem already does the heavy lifting by clearly showing the dative masculine -em ending. Since the case and gender are already obvious, the adjective staubig just takes the standard weak ending, which is -en for all dative nouns.
Would it mean the same thing if I said Wir müssen nach irgendeinem staubigen Karton suchen?
No, the meaning would change completely! in einem Karton suchen means you are digging inside the box to find something else. nach einem Karton suchen uses the phrase suchen nach (to search for), meaning the cardboard box itself is the missing object you are trying to find.
Can I use Karton for any type of box?