Anna heeft haar koffer moeten openen bij de douane.

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Questions & Answers about Anna heeft haar koffer moeten openen bij de douane.

Why does the sentence use heeft moeten openen instead of something like heeft geopend moeten or heeft gemoeten openen?
In Dutch, when you combine an auxiliary (heeft), a modal (moeten) and a main verb (openen) in the perfect tense, you put the finite auxiliary in second position and leave both the modal and the main verb in their infinitive forms at the end. You never insert a past participle of the main verb or the modal into the cluster. That’s why it’s heeft moeten openen, not heeft geopend moeten or heeft gemoeten openen.
What is the function of the modal verb moeten here?
The verb moeten expresses an obligation or necessity. In this sentence it means Anna “had to” open her suitcase—she was required by the customs officers to do so.
Why is the possessive pronoun haar used before koffer, and why isn’t there a separate article?
A Dutch possessive pronoun (like haar) always goes directly before the noun and replaces the definite article. So haar koffer literally means “her suitcase.” You never say de haar koffer; haar stands in for “de.”
Why does douane take the definite article de, and what does bij de douane mean?
Douane is a feminine noun in Dutch and therefore takes the article de. The phrase bij de douane literally means “at customs.” The preposition bij is used for being at or with an institution/place (for example bij de dokter, bij de bank).
Could you rearrange bij de douane and the verb cluster, or must moeten openen stay at the end?

The two infinitives moeten openen must stay together at the end of the main clause. However, an adverbial phrase like bij de douane can be placed before that cluster. For example:
Anna heeft bij de douane haar koffer moeten openen.

How would you express the same idea in the simple past tense?

Replace heeft moeten with the past form moest of the modal:
Anna moest haar koffer openen bij de douane.

Could haar ever be ambiguous? How do you make clear it refers to Anna’s suitcase?
By context, haar refers back to Anna. If you need to avoid ambiguity or emphasize ownership, you can say Anna moest haar eigen koffer openen or use de koffer van Anna.