Ответ:

1. They said that they were playing football.

2. He said that he was reading a book when the light went off.

3. John said to Mother that he had done his work before his dad came.

4. He said, "I can't help you, I am sorry." He said that he couldn't help.

5. She said to fill in the blank again.

6. "Read the document before you sign it," the lawyer said to his client. The lawyer advised his client to read the document before signing it.