Bis zu ihrem Abschluss in Psychologie möchte Andrea nicht umziehen.
Why ihrem after akkusative bis?
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In what way do you consider bis an accusative preposition? It's not, it takes complements either without overt case markers ("bis bald") or governed by a construction other than the "bis" ("bis nächsten Montag" - temporal accusative; "bis zum Wahnsinn" - dative governed by "zu"). – Kilian Foth Apr 14 '19 at 5:42
Bis is always an accusative preposition. Here the preposition that governs the case is zu (an always-dative preposition), that is why you have ihrem instead of ihren.
The preposition "bis" can be used with the german Akkusativ and Dativ as well. Usually "bis" with Akkusativ but if you use "bis zu" then the Dativ may follow (Temporal preposition).
Usually one can omit the "zu" when using "bis zu" and it seems "bis" would required always Dativ which is not true. You can find and construct a variety of sentences using either of the casi.
Best wishes, SG
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1Thanks. Strange that this sentence used as an example of the accusative case here:deutsch-als-fremdsprache-lernen.de/… – Vladimir Nabokov Apr 13 '19 at 18:21
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Well, I don't know about this website or can give you a more rigorous grammatical explanation, however what I stated is usually true. Maybe somebody else can chime in? – stephanmg Apr 13 '19 at 18:28
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1I just wonder why they used this sentence (which is akkusative + dative) in the plain accusative example...thanks. – Vladimir Nabokov Apr 13 '19 at 18:38
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