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