regret

  1. (noun) Something you feel sorry about doing or not doing. “I have a few regrets”. 2. (verb) To feel sorry about doing something in the past. REGRET (NOT) DOING SOMETHING: “I regret not studying harder.” 3. (verb) To express that you are sorry to something you are going to do now. REGRET TO DO ST: “I regret to inform you that you did not pass the exam.”. RELATED: regretful (adj.), regretfully (adv.)

This is a high-frequency exam item. Example questions:

I wish I hadn’t done that. / I shouldn’t have done that. –> I regret doing that.