Bonjour,
Réponse :
1/
a. He must have understood how Congress works.
b. He must have wanted to be president.
c. He must have been at least 35 years old.
d. He must have had strong opinions.
e. He must have been born in the US.
2/
a. He must have been an American citizen for seven years.
b. He must have lived in the state he represents.
c. He must have had enough money to finance his campaign.
d. He must have been popular with the voters.
Explications :
Must have + participe passé => permet d'exprimer l'obligation au passé.
( Participe passé : - Base verbale-ed ( verbes réguliers )
- A apprendre par coeur ( verbes irrégulier )
; )
