Bonsoir
la seule façon d'utiliser may dans des phrases passées est => sujet + may have + participe passé
a- He didn't get the job. He may have arrived late at the interview.
b- It was his first rehearsal. He may have been stressed.
c- He may have had an accident.
d- He may have missed the bus.
e- He may have bought flowers again.
f- She may not have known the truth.
g- The murderer may have killed her with a knife.
h- She may have called him before she died.
i- He may not have forgiven her.
j- Tom may not have done his homework.
k- It may have been too late.
l- He lay not have been ill yesterday.
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Bonne soirée ☺☺☺