Breakdown of Wir können nicht anfangen, weil der Saal geschmückt sein muss.
sein
to be
wir
we
nicht
not
können
can / to be able to
müssen
to have to, must
anfangen
to start
weil
because (subordinating)
der Saal
the hall
schmücken
to decorate
Questions & Answers about Wir können nicht anfangen, weil der Saal geschmückt sein muss.
Why does this sentence use geschmückt sein muss instead of geschmückt werden muss?
This is the difference between the state passive (Zustandspassiv) and the action passive (Vorgangspassiv). Using sein focuses on the finished result: the hall must already be in a decorated state before we can start. If you used werden, it would mean the action of decorating must happen right then.
Why is muss placed at the very end of the sentence?
Because weil is a subordinating conjunction, it pushes the conjugated verb to the end of the clause. Here, the conjugated verb is the modal muss. The past participle geschmückt and the infinitive sein stack up right before it.
Could I use denn instead of weil here to mean the same thing?
Yes, but the word order would change. denn does not kick the verb to the end because it takes position zero. If you used it, the clause would be denn der Saal muss geschmückt sein. Both are perfectly fine, though weil is more common in spoken German.
I know schmücken means to decorate. Could I use dekorieren instead?
Yes, dekoriert sein muss works perfectly here too. schmücken often implies making something festive or beautiful for an occasion like a party, whereas dekorieren can be a bit more general, like interior design.
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