Question

Complete the sentences with ' or'S
1) The teachers
book.
2) The cat
tail.
3) The men
T-shirts.
4) My parents
house.
5) The mice
cheese.
6) Mark and James
family.
7) This is Julian
keys.
8) The secretaries
tablets.
9) These are the boys
bikes.
10) Charles
book is new.
11) Billy
car is blue.
12) The girls
glasses are new.

Answer 1

1. the teacher's book
2. the cat's tail
3. the men's t-shirts
4. my parents' house
5. the mice's cheese
6. mark and james' family
7. this is julian's keys
8. the secretaries' tablets
9. these are the boys' bikes
10. Charles' book is new
11. Billy's car is blue
12. the girls' glasses are new

você adiciona 'S se o substantivo não tiver um s ou se não for no plural, se acaba em S é só por o ' na frente.

o rabo do gato - the cat's tail

os rabos dos gatos - the cats' tails

Viu a diferença? espero ter ajudado!!