Réponse :
a) the treaty is being signed by the two officials
b) the novel has been written by her
c) the deer was being chased by the lion
d) a pancake was made yesterday by mother
e) the mail was sent by anna
Explications :
il faut changer la place du sujet par celle dun complement et ajouter un auxiliere. il faut aussi mettre les verbes au participe passe (3e colonne des verbes irreguliers ou ED)