Listen to the first sentence, which will be in present/implied future tense, and change it to the past participle.

Your friend says some action is in the present, but you disagree because it actually already has taken place.

 

For example, you might hear "Hun finder en mand" (She is finding a husband) and, during the silence afterward, you will say "Nej, hun har fundet en mand" (No, she has found a husband).  Then you will hear the correct answer ("Hun har fundet en mand") after the silence, so you can check your accuracy.