How can one talk about their thoughts or what they used to believe before another action in the past.
If that thought or belief is general, then I guess we can use used to.
Assume these examples (the first one is more general than the second one):
1- Before today, I (believed / was believing / used to believe) that the moon (is / was) a star.
2- I (thought / was thinking / used to think) she (was / is) still in the office before I called her.
Which ones in the parentheses are correct?