1. It is hot, but it WAS cold two days ago.
2. The First World War BEGAN in 1914.
3. Hurry up! The lesson HAS just BEGUN!
4. IS he WEARING a raincoat now?
5. WILL you go to the museum tomorrow?
6. I opened the door and looked out. There was no one there.
7. He's met you, HASN`T he?
8. He's having breakfast, ISN`T he?
9. what DID he cook?