Ответ:

1. He said he lost his watch.
2. She said she's very busy.
3. She dais she can't go to the party.
4. He said he has to go out.
5. He said he's learning Russian.
6. She said she doesn't feel very well.
7. They sai they will be home late.
8. She said she has just come back from holiday.
9. She said she's going to buy a computer.
10. They said they haven't got a key.