Hij moet zijn jas in de hal hebben opgehangen.

Questions & Answers about Hij moet zijn jas in de hal hebben opgehangen.

Does 'moet' express an obligation in this sentence?
No, here moet expresses a strong logical deduction or probability, just like 'must' in the English phrase 'must have'. It means we are assuming he hung his coat there based on evidence, not that he was required to do it.
Why are there two verbs, 'hebben' and 'opgehangen', at the end of the sentence?
This is the perfect infinitive structure used for past deductions. The conjugated modal verb moet sits in the second position, pushing the rest of the verb phrase to the end. To express 'have hung', we use the infinitive hebben and the past participle opgehangen together at the end of the clause.
Could I change the order of the verbs at the end to 'opgehangen hebben'?
Yes, you can. In Dutch verb clusters at the end of a clause, when you have a past participle and an auxiliary infinitive, both word orders are grammatically correct. Saying opgehangen hebben is just as natural as hebben opgehangen.
How is the past participle 'opgehangen' formed?
It comes from the separable verb ophangen (to hang up). When making a past participle for a separable verb, the standard ge- prefix gets squeezed between the separable preposition (op) and the main verb (hangen), resulting in opgehangen.

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