Wir danken dem Lehrer für den Plan.

Questions & Answers about Wir danken dem Lehrer für den Plan.

Why is dem Lehrer in the dative case, but den Plan in the accusative case?
Because the verb danken requires its object (the person you thank) to be in the dative case. The teacher is the person being thanked, so he’s dative (dem Lehrer). The plan is the thing you thank for, and the preposition für always takes the accusative, so it’s den Plan.
How do I decline der Lehrer and der Plan in this sentence?

Lehrer (masculine noun): • Nom: der Lehrer
• Acc: den Lehrer
• Dat: dem Lehrer
• Gen: des Lehrers

Plan (masculine noun): • Nom: der Plan
• Acc: den Plan
• Dat: dem Plan
• Gen: des Plans

Here you need the dative form dem Lehrer (because of danken) and the accusative form den Plan (because of für).

Can I change the word order for emphasis?

Yes. You can front almost any element: • Dem Lehrer danken wir für den Plan. (To the teacher we thank for the plan.)
Für den Plan danken wir dem Lehrer. (For the plan we thank the teacher.)
The neutral order is Wir danken dem Lehrer für den Plan.

Could I use a pronoun instead of dem Lehrer?

Yes. Use the dative pronoun ihm (for “him”):
Wir danken ihm für den Plan.

What’s the difference between danken and sich bedanken?

danken + dative: a direct “to thank” (Wir danken dem Lehrer).
sich bedanken + bei + dative (person) + für + accusative (reason): a reflexive, slightly more formal “to give thanks” (Wir bedanken uns bei dem Lehrer für den Plan).

Is danken reflexive?
No. danken itself is not reflexive; it takes a dative object. If you want a reflexive construction, use sich bedanken, which then requires bei before the person thanked.
Can I omit the article and say für Plan instead of für den Plan?
No. German generally requires an article, demonstrative, or other determiner before a noun. You must say für den Plan (or für einen Plan if you mean “for a plan”).
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How do German cases work?
German has four grammatical cases: nominative (subject), accusative (direct object), dative (indirect object), and genitive (possession). The case determines the form of articles and adjectives. For example, "the dog" is "der Hund" as a subject but "den Hund" as a direct object.

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