1.She said she had to finish this test in 15 minutes

must->had to HTĐ->QKĐ

2. She said this was her brother 

HTĐ->QKĐ

3.She told me that I looked very beautiful that day 

today->thatday

4.She said she could help me the next day

tomorrow->the next day

can->could

5. She told me she often went to bed early

go->went

6.She told me she didn't like chocolate

don't->didn't

7.She said she wouldn't see me the next day

won't->wouldn't

tomorrow->the next day

8.She said she was living in Paris then

now->then/at the moment

Iam->I was

9.She told me she would visit her parent at the weekend

will->would

10.He told me he liked playing chess in his free time

6. She said that she had to finish that test in 15 minutes

7. She said that that was her brother

8. She told me that I looked very beautiful that day

9. She said to me that she could help me the next day

10. She told me that she often went to bed early

11. She told me that she didn't like chocolate 

12. She said to me that she wouldn't see me the next day

13. She said that she was living in Paris then

14. She told me that she would visit her parents at the weekend

15. He told me that he liked playing chess in his free time

S + said + (that) + S + V

S + said + to + O + (that) + S + V

S + told + O + (that) + S + V