When talking about a recently completed action where the result matters more than who did it, Danish uses the present perfect blive-passive.
To form it, use er blevet followed by the past participle of the main verb. Notice that Danish uses er (is) rather than har (has) as the helper verb.
| The long tunnel under the river has been constructed. | Den lange tunnel under floden er blevet anlagt. |
| The new bike lane has been constructed near the school. | Den nye cykelsti er blevet anlagt i nærheden af skolen. |
If the verb has a particle, such as rive ned (to demolish), the particle follows the past participle.
| The old factory by the subway has been demolished. | Den gamle fabrik ved metroen er blevet revet ned. |
This structure works exactly the same way in subordinate clauses.
| He believes that the subway has been expanded. | Han tror at metroen er blevet udvidet. |
| She says that the sidewalk has been widened. | Hun siger at fortovet er blevet udvidet. |
Er blevet or blev?
The choice usually works as in English. Er blevet is for a result you see now, with no past time named; when you say when it happened (i går, sidste år), use the simple past blev: Cykelstien blev fjernet sidste år.
| The old house in front of the fountain has been demolished. | Det gamle hus foran springvandet er blevet revet ned. |
The perfect is also how you report a change someone has noticed:
| The children say that the intersection has been repaired. | Børnene siger at krydset er blevet repareret. |
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