11. She said:”I am going away tomorrow.” 12. She said:”I like this song from the sixties.” 13. Della said:” Tom has invited

В данном случае, глагол в речи автора находится в прошлом времени, поэтому меняем время в прямой речи с настоящего на прошлое: Present Continuous на Past Continuous, Present Simple на Past Simple, Present Perfect на Past Perfect.

1) She said she was going away the next day.

2) She said she liked that song from the sixties.

3) Della said that Tom had invited her to go sailing at the weekend.

4) The manager said they had received a complaint about the prices.

5) Paul told us that someone had stolen his case.