Réponse :
Bonjour,
il faut raisonner de manière logique:
going to représente le futur
used to représente le passé
Donc tu dois juste regarder la phrase et voir si elle parle d'un evenement passé ou futur.
a. When Laura was 15, she used to babysit.
b. Jim's worl part-time is going to be next month
c. Jane used to be more motivated when she worked as a waitress
et le dernier je pense que les deux sont possible
d.1 John's parents used to asked him to stop working as a waiter because he's had bad marks.
d.2 John's parents are going to ask him to stop working as a waiter because he's had bad marks
Voila, j'espère vraiment avoir pu t'aider et ne pas m'être tromper au dernier :)