Ответ:
1. Не will be writing his article the whole day tomorrow.
He will not (won't) be writing his article the whole day tomorrow.
Will he be writing his article the whole day tomorrow?
2. It will be raining when you go out of the house.
It will not (won't) be raining when you go out of the house.
Will it be raining when you go out of the house?
3. We will be discussing the problem while you will be playing the piano.
We will not (won't) be discussing the problem while you will be playing
the piano.
Will we be discussing the problem while you will be playing the piano.
4. I will be going to Moscow at this time tomorrow.
I will not (won't) be going to Moscow at this time tomorrow.
Will I be going to Moscow at this time tomorrow?
5. I will be watching TV when my mother will be coming.
I will not (won't) be watching TV when my mother will be coming.
Will I be watching TV when my mother will be coming?