Riscrivi le frasi usando must have, May have o can't have +past participle.
1)Bill's late. I'm certain that he Misseri the bus.
2) Perhaps she's broken per leg!
3) Paula was with me all day, so I know She didn't use your computer.
4) I Rhino maybe l've Lost my keys.
5) The exam was Easy. I'm sure we passed.
Poi mi sapete spiegare quando si utilizza must have, May have, might have, can't have