j'ai besoin d'aide sur cet exercice, je n'y arrive pas !

Réponse:
1. I was talking to my sister on the phone wyen i heard the crash.
2. Something strange happened to me last night. I was walking home and i had the feeling that someone was following me.
3. "What were you doing when your mother came in?" I watched TV. It was a documentary on the North Pole.