someone has
La police pense que quelqu'un a trafiqué les freins.
The police think that someone tampered with the brakes.
Someone coughed.
Quelqu'un a jeté un sort à Layla.
Someone cast a spell on Layla.
Quelqu'un a dérobé ma voiture.
Someone stole my car.
Has anyone fed the dog?
Quelqu'un a nettoyé ma chambre pendant que j'étais parti.
Someone cleaned my room while I was away.
Someone laughed.