Breakdown of Die Tür wäre von mir aufgeschlossen worden.
ich
I
sein
to be
von
from, of / by (agent in passive clauses)
die Tür
the door
der
who, which, that (relative pronoun; die, das)
werden
to be (passive auxiliary + past participle)
aufschließen
to unlock (e.g. a door with a key)
Questions & Answers about Die Tür wäre von mir aufgeschlossen worden.
Why do we use wäre instead of hätte for "would have"?
This sentence is in the passive voice. In German, all perfect passive tenses are built using the helper verb sein (to be), never haben (to have). To express the hypothetical past passive ("would have been"), we take the normal past perfect passive (war ... worden) and change the helper verb war into its Konjunktiv II form: wäre.
Why is the final word worden and not geworden?
When werden is used as a helping verb to form the passive voice, its past participle is shortened to worden (dropping the ge- prefix). You only use geworden when werden is the main verb of the sentence, meaning "to become" (for example: Ich wäre Arzt geworden - I would have become a doctor).
Could I use durch mich instead of von mir to mean "by me"?
Not in this context. In passive sentences, you use von (plus the dative case) when the action is performed by a direct, active agent—usually a person or an animal. You use durch (plus the accusative case) for a means, tool, or indirect cause (like a machine or the weather). Since "me" is the conscious person turning the key, it has to be von mir.
How is the word aufgeschlossen formed here?
It is the past participle of the separable verb aufschließen (to unlock). For separable verbs, the -ge- prefix used to build the past participle gets wedged between the separable prefix (auf-) and the verb stem (-schlossen). In this sentence structure, it sits right before the final passive helper worden.
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