Réponse:
3.I knew Sarah was busy so I didn't disturb her.
4.We were very tired,so we left the party early.
5.The bed was very uncomfortable.I didn't sleep well.
6.The window was open and a bird flew into the room.
7.The hotel wasn't very expensive.It didn't cost much to stay there.
8.I was in a hurry.So I didn't have time to phone you.
9.It was hard carrying the bags.They were very heavy.
Explications:
La plus part sont négatives donc on a pas à changer les bases verbales,seulement les verbes irréguliers changent comme : LEAVE.