Réponse :
was talking, heard
happened, was working
was taking place, interrupted
disappeared, were looking
Explications :
Was/Were + ing quand c'est "en train de" ou imparfait
ED quand c'est passé composé
exemple:
J'etais dans la cuisine/en train de cuisiner quand la porte a grincé.
I was in the kitchen/was cooking whe the door cracked
