Form the words as in the example. example = the textbooks of the pupil-the pupil^s textbooks 1) the letter of her 2) the nickname of her fried- 3) the photos of the teachers- 4) the sharpeher of his brother- 5) the felt-tip pens of their sons- 6) the cartridges of the children- 7) the computer of my parents-
her friend's nickname
the teachers' photos
his brother's sharpener
their sons' felt-tip pens
the children's cartridges
my parents' computer