Aide en Anglais may/must ...

Bonjour, je doit réécrire les énoncés à l'aide de l'amorce proposée.

Je n'arrive pas ces 3 phrases ...

1. Perhaps that was the car used by the terrorists.
=> That may .....................

2. They probably parked the car in the lane and walked up the driveway.
=> They must ................

3. I'm certain the police are trying to trace the housekeeper.
=> The police must ........

pour là 1 j'avais commencé à mettre :
That may have been the car used by the terrorists.

là 2 je sais vraiment pas

et là 3 :
They must parked the car in the lane and walked up the driveway.

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Sinon je dois traduire en anglais :
Tu aurais pu m'envoyer un E-mail => You could send an E-mail.
C'est juste ?