6: The children say that they hadn't had anything to eat

7: She tells me that she couldn't stand classical music

8: I've told them that I would come again

9: He'll say that he needed money to visit his parents

10: She says that she didn't know how much it costed

6.We haven’t had anything to eat.

⇒The children say they haven't had anything to eat.

7.I can’t stand classical music

⇒She tells me she can't stand classical music.

8.I’ll come again.

⇒I've told them I'll come again.

9.I need money to visit my parents.

⇒He'll say he needed money to visit his parents

10.I don’t know how much it costs.

⇒She says she doesn't know how much it  cost.