Bonjour,
Réponse :
WAS OU WERE ( prétérit de "be" )
When I was a child, I lived in Hollywood. In that city, there were actors and rich people. There was a very beautiful house near my school. In front of that house, there was a big park, with many flowers and trees. There were slides and trees in that park. And there were 6 stadiums and 4 swimming pools in the city.
Explications :
WAS : 1ère et 3ème personne du singulier
WERE : 2ème personne du singulier et toutes les personnes du pluriel