Bonjour !

Réponse :

1. Oliver's mum sounds fed up.

2. I think they're the boys' books.

3. It is a teenage girl's bedroom.

4. The neighbours' dog chased a cat.

5. The teachers' books are on the desk.

6. Mike's socks are under the white bed.

7. Jade's lamp is on the floor.

8. Mother's sister is very beautiful.

9. The pupils' bags are very big.

10. Kristen's shoes are white and black.

Explications :

Lorsque le nom est au singulier, on rajoute -'s.

Lorsque le nom est au pluriel, on rajoute -'.

J'espère t'avoir aidé. Bon courage !