We use future continuous when:
two actions happen at the same time (I will be singing while she is cooking)
longer action interrupted by a shorter one (I will be driving when she comes)
future arrangements (I will be working tomorrow)
for temporary actions (Next week we will be using bikes instead of cars)
for processes (I will be getting taller and taller)
when we specify time like for 2 hours or in the morning
Does the construction "be going to be doing" work the same as future continuous? I named 6 uses of future continuous. Can we replace them all with "be going to be doing"?