REMEMBER No Future in Time Clauses
Like all future forms, Future in the Past cannot be used in clauses beginning with time expressions such as: when, while, before, after, by the time, as soon as, if, unless, etc. Instead of using Future in the Past, you must use Simple Past.
Examples:
I already told Mark that when he would arrive, we would go out for dinner. Not Correct
I already told Mark that when he arrived, we would go out for dinner. Correct
ACTIVE / PASSIVE
Examples:
I knew John would finish the work by 5:00 PM. Active
I knew the work would be finished by 5:00 PM. Passive
I thought Sally was going to make a beautiful dinner. Active
I thought a beautiful dinner was going to be made by Sally. Passive