Mary will be living in this house.       (Conditionally: If she can pay the rent....)

You know what's next -- the negative sentence:
(S + WON'T + BE + V1 + ING)
Mary won't be living in this house.

And of course, the question:
(WILL + S + BE + V1 + ING)
Will Mary be living in this house?

And here's one for you:
(WH + WILL + S + BE + V1 + ING)
this be in will house Mary why living