- fact: Mom said we are going to need some apple ( means "we do need some apple . " do i understand right ?)
Yes, that's what it means.
(Say: "Do I understand right?")
- tense: Mom said we were going to need some apple ( I don't know exactly what it means )
Absent context, I can't be sure what it means either.
I'm afraid I am not sure what you mean by fact or tense. :?