Expresses future action that will begin at some point of time in future and continue for some time
The stars will be twinkling at night
subject + will be/ shall be + v1st form + ing + object
John will be coming tomorrow.
will/shall + subject + be + v1st form + ing + object
Will the tailor be sewing the clothes?
subject + will not be/ shall not be + v1st form + ing + object
He will not be waiting for him to return from America.