Bonjour
1) My mum was reading a thrilling book when i arrived
She was walking her her dog in the street when her phone rang
Your were brushing your teeth when your little sister jumped on you
désolé, je n'ai pas trouvé pour celle la :
the garage/painting/when/was/started/the car/my brother
3)
Nous étions en train de manger quand ma soeur arriva
We were eating when my sister arrived
J'étais en train de prendre (-take) une douche quand ma mère est tombé.
I was taking a shower when my mum fell
J'étais en train de parler avec ma petite soeur quand un homme frappa (knock) à la
porte
I was talking to my little sister when a man knocked on the door.