can't have / may not have

This exercise is based on the language presented on page 123 of How English Works

Match the items on the right with the items on the left.

They left 30 minutes ago and the journey takes one hour. They ______ arrived yet. ??? can't have may not have He remembers everything. He ______ forgotten. ??? can't have may not have Are you sure he got the details? He ______ had the e-mail. They do get lost. ??? can't have may not have We don't know if he was driving. He ______ been coming by car. ??? can't have may not have He looks very tired. He ______ had enough sleep. ??? can't have may not have She passed me in the street without talking to me. She ______ seen me. ??? can't have may not have He's not very intelligent. If he passed the exam, it ______ been very difficult. ??? can't have may not have I don't know if he was joking. He ______ been serious. ??? can't have may not have Nobody knows for sure what happened. It ______ been an accident but we cannot be sure. ??? can't have may not have The car didn't stop at the lights. The driver ______ seen the red light. ??? can't have may not have He has not returned my call. I suppose he ______ returned from his business trip yet. Who knows? ??? can't have may not have He walked into the door. He ______ been looking where he was going. ??? can't have may not have

Your score is