1. Nick night have left his exercise book at
home. 2. You may have left your umbrella in the bus. 3. He might have gone
to the cafe to wait for us. 4. It might have been Helen who rang you up. 5. They may have come by plane. 6. She might have had a very good English
teacher. 7. It might have been too cold for the children to go out. 8. He may have taken his children to the zoo. 9. They may not have
seen us in the crowd. 10. Robert may have used a dictionary. 11. Mary might have misunderstood you. 12. Henry may have waited for us there. 13.
Ann might have returned very late last night. 14. They may have seen
the new play.