Der Fall war schwierig, aber der Detektiv dachte an das Motiv.

Questions & Answers about Der Fall war schwierig, aber der Detektiv dachte an das Motiv.

How is dachte formed, and why isn't it "denkte"?
dachte is the simple past (Präteritum) of denken (to think). denken is a mixed verb. This means it mixes rules from regular and irregular verbs. Like irregular verbs, the stem changes (both the vowel and the consonants change from enk to ach). But like regular verbs, it gets the standard past tense ending -te added to the new stem, making it dachte.
Why do we use an here instead of a word like "über" for "about"?
In German, verbs often pair with specific prepositions. To express thinking about someone or something, you use denken an. If you want to express a deeper pondering or reflecting, you would use a different verb like nachdenken über. Here, the detective is directing his thoughts to the motive.
Why is das Motiv in the accusative case after an? I thought an was a two-way preposition.
You are right, an is a two-way preposition! When used with physical locations, it takes the dative for a fixed position and accusative for movement. However, when an is part of a fixed verb-preposition pair like denken an, it almost always requires the accusative case. You can imagine mentally directing your thoughts toward the motive.
Does the word aber change the sentence structure?
No, aber is a coordinating conjunction, which means it occupies "position zero" in the clause. The subject (der Detektiv) is in position 1, and the verb (dachte) stays exactly where it should be in position 2, just like in a standard main clause.

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