Making Deductions in the Past
When you misplace an item, you often need to retrace your steps and make deductions about what happened to it. If you are absent-minded (verstrooid), things might simply go missing (spoorloos).
| I was very absent-minded today. | Ik was vandaag erg verstrooid. |
| My keys are missing. | Mijn sleutels zijn spoorloos. |
"Must Have" with Hebben
To express that someone "must have" done something, Dutch uses a conjugated modal verb combined with a perfect infinitive.
Place a form of moeten in the standard working position for verbs. Then, send the auxiliary verb hebben and the past participle of the action verb to the end of the sentence.
Note: While the order of the final two verbs can often be swapped, placing *hebben immediately before the past participle is very common and natural.*
| The absent-minded teacher must have put his glasses down on the counter. | De verstrooide docent moet zijn bril op de toonbank hebben neergelegd. |
| He must have hung his coat in the hall. | Hij moet zijn jas in de hal hebben opgehangen. |
| We must have put the ticket on the dashboard. | Wij moeten het kaartje op het dashboard hebben gelegd. |
Deductions with Zijn
Just as in the standard present perfect tense, verbs indicating a change of state or direction—like slipping (glippen) or falling (vallen)—use zijn instead of hebben. The verb vergeten (to forget) also uses zijn when you leave an item somewhere.
The word order remains exactly the same.
| The coin must have slipped out of my pocket. | De munt moet uit mijn zak zijn geglipt. |
| The ring must have fallen into the crevice of the couch. | De ring moet in de spleet van de bank zijn gevallen. |
| The bag is missing, so I must have forgotten it in the train. | De tas is spoorloos, dus ik moet hem in de trein zijn vergeten. |