Hello, here is the answers about your questions :
1. All his life, Sherlock Holmes was helped by Dr. Watson.
2. Romeo and Juliet was written by Shakespeare.
3. In 1955, Disneyland was built Walt Disney.
4. Australia was discovered by Captain Cook.
5. In 1963, President Kennedy was assassinated by a mad man.
Pour comprendre, il te suffit simplement d'y inverser les deux sujets, de replacer le verbe tel que : was + Verbe au présent perfect (-ed à la fin, sauf les verbes irréguliers qui changent)
En espérant t'avoir aidé pour tes questions.
