Der Haken ist kaputt, deshalb darf der Mantel nicht daran hängen.

to be

Breakdown of Der Haken ist kaputt, deshalb darf der Mantel nicht daran hängen.

• nicht: not
• deshalb: therefore
• hängen: to hang

Questions & Answers about Der Haken ist kaputt, deshalb darf der Mantel nicht daran hängen.

Why does Der Haken start with Der and why is Haken capitalized?

Haken is a noun, and all German nouns are capitalized.
der is the masculine nominative singular definite article, because Haken is masculine (der Haken). Here it’s the subject of the clause Der Haken ist kaputt.

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Does Der Haken only mean a physical hook, or can it mean something else?

It can mean both:

• Literally: der Haken = a hook (like on a wall or hanger).
• Figuratively: Der Haken ist … can also mean The catch is …
  In your sentence, the second clause about the coat makes the literal “hook” meaning most likely.

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Why do we say ist kaputt and not use a verb like “break”?

German often describes a broken state with sein + adjective:

• kaputt = broken / not working / damaged
  So Der Haken ist kaputt focuses on the current state (“is broken”). A more action-focused alternative would be something like Der Haken ist kaputtgegangen (“has broken”).

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What is deshalb, and why is there a comma before it?