Mes réponses sont probablement fausses pouvez vous m'aider pour les 2 exos svp

Exercice 4 :
1. When did you get the idea for Harry Potter ?
2. How long did it take to write the first book ?
3. How old is Harry Potter ?
4. How many books have been sold ?

Exercice 5 :
F.
1. That's his car, not yours !
2. I think it was my idea, not hers.
3. Don't you think it's our problem, not theirs ?
4. That's her bag, not ours.

G;
1. Is this your parent's car ?
2. I don't Jonathan Lee's new film.
3. Clare's new boyfriend speaks Chinese.
4. The world's population is increasing.