Answers exercise 3:
1= They are my friends’ shoes
2= No, it is Mrs Miller’s car.
3= No, they are my sisters’ bikes.
4= No, it is Tom’s phone.
5= They are Sandra’s keys.
Answers exercise 4:
1A = Whose
1B =Millers’
2A = Sam’s
2B = Barbara 's
3A = teacher’s
3B = Smith’s
4A = Who’s
4B = Monkeys'
5A = Whose
5B = James’s