11. “ I'll help my mum with housework this weekend" she said
=> she said that she would help her mum with housework that weekend
12. "My father is a doctor here", my friend said
=> my friend said his father was  a doctor there 
13. "I am going on holiday tomorrow", the boy said to his neighbor.
=> he boy said to his neighbor that he was going on holiday the next day
14. "You will have to finish all these exercises before next week", the teacher said to his students
=>  the teacher said to his students that they would have to finish all these exercises before next week