At have + participle
An infinitive can describe something that is already done. It is built like the perfect tense, but with the infinitive at have instead of har or havde:
| perfect | perfect infinitive |
|---|---|
| Jeg har spist. | (efter) at have spist |
| Han har sagt farvel. | (uden) at have sagt farvel |
It follows the same words that take an ordinary infinitive — efter, uden, for and adjectives like glad for:
| After having eaten, we went for a walk. | Efter at have spist gik vi en tur. |
| She left without having said goodbye. | Hun gik uden at have sagt farvel. |
| I am glad to have met you. | Jeg er glad for at have mødt dig. |
When the phrase opens the sentence, the main clause starts with its verb, exactly as after any fronted adverbial:
| After having read the book, I understood more. | Efter at have læst bogen forstod jeg mere. |
Ikke
In a negative, ikke comes before at:
| It was stupid not to have asked. | Det var dumt ikke at have spurgt. |
Verbs that form their perfect with være use at være here: efter at være kommet hjem (after having come home).
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