Breakdown of Der Lastwagen war gestern auf die Lieferung vorbereitet.
sein
to be
auf
on / to (down/up to a level)
gestern
yesterday
der
who, which, that (relative pronoun; die, das)
Questions & Answers about Der Lastwagen war gestern auf die Lieferung vorbereitet.
Why doesn't the past participle vorbereitet have a -ge- in it?
The verb vorbereiten has two prefixes: the separable vor- and the inseparable be-. Usually, separable verbs get a -ge- in the middle for the past participle (like vorgestellt). However, because the core verb starts with the inseparable prefix be-, it rejects the -ge-. Therefore, it becomes vorbereitet instead of "vorgebereitet".
Is "war ... vorbereitet" the past perfect tense or the passive voice?
It is the statal passive (Zustandspassiv) in the past tense. It describes the condition or state the truck was in ("was prepared"), rather than the action of someone actively preparing it. You form this state-focused passive by using sein (here, the past tense war) plus the past participle (vorbereitet). You can also simply think of vorbereitet as acting like an adjective here.
Why is it "auf die Lieferung" (accusative) if "auf" is a two-way preposition?
When auf is used as a fixed preposition for a specific verb—like vorbereiten auf (to prepare for)—it almost always takes the accusative case. Because it is being used abstractly here rather than to describe physical location or movement, the usual two-way spatial rules do not apply. You just have to memorize that vorbereiten goes with auf + accusative.
Why does "gestern" come before "auf die Lieferung"?