Question

8. She said to you, "How have you done this?"
9. I said to my sister, “Where did you keep my pen ?"
10. You said to me, “How did you solve this ?"
11. I said to her, “Who gave you the information ?
12. The porter said to me, "Whom do you want?"​

Answer 1

But what's the head question ?.

without it how can we come to know what to do ??.

Answer 2

Direct to indirect speech