In this lesson there is an example of passer in passé compose using être:
Ma tante est passée par la boulangerie...
and using avoir:
Nous avons passé une bonne semaine...
I can't see an explanation for this and I'm confused
In your first example,
Ma tante est passée par la boulangerie = My aunt went past/by the baker's
The verb 'passer' is intransitive, meaning it doesn't have an object following the verb and it takes 'être'.
In the second example,
Nous avons passé une bonne semaine = We had a good week
Passer has an object, 'une bonne semaine', it is a transitive verb and takes 'avoir'.
Hope this helps!
Look here: Passer/se passer/se passer de - the different meanings of the verb "passer" in French
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