Form the words as in the example

Example: the texbook of the pupil - the pupli's textbooks

1 the letter of her friend - .....

2 the nickname of my sister - .....

3 the photos of the teachers -....

4 the sharpener of his brother -....

5 the felt-tip pens of their sons -....

6 the disks of the children -....

7 the computer of my parents - ....
Прошуууууууу помогитееееее!!!!!