Ответ:

8. Tom said that everyone took him to his twin brother and behaved accordingly

9. Nelly said that she asked the professor some questions on grammar

10. She said that her mother wants to know if I am coming to see her tomorrow

11. The doctor said that I will have to stay in bed for another five day

12. The instructor pointed out that only the best players can participate in the Olympics

13. He said that it was difficult for him to persuade her to come here

14. Mabel said that as soon as I come to their town, I should visit her house and stay here for a couple of days

15. Monica said to Jess that Jess is able to solve this problem alone without any outside help

16. She said that I will laugh if she tells me her real name

17. The teacher said that I must copy this text and mark all the grammatical mistakes in it

18. Alice said to Meg that she shall miss her when she leave for Paris

19. Marsha said that she did not mean to hurt me. She only wanted to told me what he had always concealed