krävts

In a sentence

• Det har krävts mycket ansträngning för att nå detta mål.

  It has required a lot of effort to reach this goal.

  Here, 'krävts' is the past participle form of 'kräva' used to indicate an action (requiring effort) that has been completed.

• Om provet hade varit svårare, hade det krävts mer tid för att slutföra det.

  If the test had been harder, it would have required more time to complete it.

  In this sentence, 'krävts' reflects its use in a conditional past perfect mood, indicating hypothetical necessity.

• Det kommer att ha krävts grundliga förberedelser när arbetet väl börjar.

  There will have been thorough preparations required when the work finally starts.

  'Krävts' here is used in a future perfect form, expressing an action that will be completed relative to another future point.