Réponse :
When I was five, I used to suck my thumb. Did you use to suck your thumb too?
I used to sleep in the afternoon. Did you use to sleep in the afternoon too ?
I used to believe in Father Christmas. Did you use to believe in Father Christmas too ?
Explications :
Attention à la phrase affirmative on met 'used' mais à la question 'use' car la marque du prétérit / passé est déjàa contenue dnas le 'did', le mot interrogatif de la question
