Образуйте притяжательный падеж существительного при помощи апострофа в словосочетаниях:
The wife of the man, days of the week, the events of the day, an outfitter for men, a salesman of cars, the arrival of the plane, the letters of my friends, the room of my sister, the newspaper of today, the toys of the child

The man's wife, the week's days, the day's events, a men's outfitter, a cars' salesman, the plane's arrival,  my friends' letters, my sister's room, the today's newspaper, the child's toys