Answer:
10. she told them it was hers and that was theirs.
11. she said she wanted to help but couldn't
12. the worker told the owner they couldn't do it without him
13. He'll say I'm his neighbour, so I should help him.
14. We'll tell him we're his friends, so he should help us
15. he says he knows me and my family very well, but I don't know him at all.
16. She says she's been waiting for me since morning.
17. he says he was reading while I was playing
18. she told him she would be his true friend
19. he says she helps me.
20. the farmer says we never quarrel with them
You're essentially just taking our the speech marks. So rather than stating direct speech you're just saying what they said.