German phrase
Müssen ~ gekauft werden?
Meaning
Must ___ be bought?
When to use it
It asks if buying is needed. This is a normal question for planning.
Example dialogue
Müssen die Bücher für das Seminar gekauft werden?
Must the books for the seminar be bought?
Ja, wir sollten sie vor dem Seminar kaufen.
Yes, we should buy them before the seminar.