Breakdown of Wir sind umgezogen, als wir das Haus gekauft haben.
sein
to be
das Haus
the house
kaufen
to buy
haben
to have
wir
we
als
when (past single event)
umziehen
to move (change residence)
Questions & Answers about Wir sind umgezogen, als wir das Haus gekauft haben.
Why do we use als here instead of wenn for the word when?
In German, als is used specifically for a single, one-time event that happened in the past, such as buying this specific house. If you were talking about an event in the present, the future, or something that happened repeatedly in the past, you would use wenn.
Why is haben at the very end of the sentence?
The word als is a subordinating conjunction. This means it introduces a dependent clause and forces the conjugated verb to the very end of that clause. Here, the conjugated helper verb haben gets pushed all the way to the end, landing even after the past participle gekauft.
Why does the first half of the sentence use sind while the second half uses haben?
Both halves are in the conversational past tense, which requires a helper verb. The verb umziehen (to move house) describes a change of location, so it takes a form of sein (to be) as its helper verb, which is why we use sind. The verb kaufen (to buy) takes a direct object and uses the standard helper verb haben (to have).
How is the past tense word umgezogen formed?
It comes from the separable verb umziehen (to move house). To form the past tense, the core verb ziehen becomes gezogen. Because it is a separable verb, the prefix um- stays attached at the very beginning, creating umgezogen.
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