Réponse :
Bonjour,
1- The bartender was working ( WORK ) behind the bar when suddenly he saw ( SEE* ) people fighting.
2- Nasty Frankie was waiting ( WAIT ) outside the club when suddenly he heard ( HEAR*) a gunshot.
3- Everybody was dancing ( DANCE ) when suddenly the music stopped ( STOP ).
4- The detective was relaxing ( RELAX ) at home with his family when suddenly his phone rang ( RING*)
5- Mary Russell was putting ( PUT* ) make-up when suddenly someone came ( COME*) into her dressing-room.
6- Duke Ellington was playing ( PLAY ) the piano at the club when someone opened ( OPEN) fire.
Explications :
Le prétérit en BE + V-ing pour les actions qui étaient en train de se dérouler elles sont interrompues par de actions au prétérit.