Her apologetic tone suggested a deep mistakenness about her past decisions.

I had mistaken the salt for sugar and ruined the cake.

She corrected a mistaken assumption before it caused any problems.

At the crowded train station, two tourists exchanged stories about the mistaken identities that led to several amusing encounters.

The police apologized after a case of mistaken identity led to an arrest.

If I'm not mistaken, the train to Kyoto departs at 3:15 p.m.