bonjour je n'arrive pas à réaliser mes exercices 1 et 2 d'anglais sur les modaux pouvez vous m'aider ? ​

exercice 1:
a. may
b. must
c. can't have
d. must have
e. might have

exercice 2:
a. The invention may save a lot of energy
b. They cant be unaware of the problem
c. They might have done the documentary to inform consumers
d. People might be beginning to change their behaviour