De postcode en het huisnummer moeten worden ingevuld.

Questions & Answers about De postcode en het huisnummer moeten worden ingevuld.

Why do we need worden here? Can't we just say moeten ingevuld?
This sentence is in the passive voice. When you use a modal verb like moeten (must) to say that something "must be done", you need the infinitive verb worden (to be) alongside the past participle ingevuld (filled in). Literally, it translates to "must be filled in."
Can I swap the order of the verbs at the end to ingevuld worden?
Yes, you can! In Dutch, when you have a cluster of verbs at the end of a sentence, the past participle (ingevuld) and the infinitive auxiliary (worden) can go in either order. Both worden ingevuld and ingevuld worden are grammatically correct and perfectly natural.
How is the past participle ingevuld formed?
It comes from the separable verb invullen (to fill in). When forming the past participle of a separable verb, the standard -ge- is sandwiched between the separable prefix (in-) and the verb stem (vuld), which creates in-ge-vuld.
Why does huisnummer use the article het?
In Dutch, compound nouns always take the article of their final piece. Because nummer (number) is a het word, any compound word ending in it, like huisnummer or telefoonnummer, automatically becomes a het word too.

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