Wanneer de brandweer aankomt, dan volgt u de instructie.

Questions & Answers about Wanneer de brandweer aankomt, dan volgt u de instructie.

Why do we use dan in the middle of this sentence?
The word dan (then) acts as a resumptive adverb. It summarizes and points back to the entire first clause (Wanneer de brandweer aankomt). It acts as a bridge, emphasizing that the second action happens as a direct sequence to the first.
Is it mandatory to use dan here?
No, you could drop it and just say Wanneer de brandweer aankomt, volgt u de instructie. However, adding a resumptive adverb like dan is very common in Dutch to make the transition between the two clauses smoother and the structure crystal clear.
Why is the word order volgt u instead of u volgt?
Because the main clause starts with the adverb dan, it triggers inversion. In Dutch main clauses, the conjugated verb must be the second element. Since dan takes the first spot, the verb volgt must come right after it, pushing the subject u to the third spot.
Why isn't the verb aankomen split up here?
Aankomen (to arrive) is a separable verb, so in a normal main clause it splits (for example: De brandweer komt aan). But the first part of this sentence is a dependent clause because it starts with Wanneer (when). In a dependent clause, all verbs get pushed to the end and reconnect into one word: aankomt.
Why does brandweer take the singular verb aankomt?
In Dutch, collective nouns for emergency services like de politie (the police) or de brandweer (the fire brigade) are strictly singular. You must always use a singular verb form with them, even if you are talking about multiple people.

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