I'll be backfilling you'll be backfilling he'll be backfilling we'll be backfilling you'll be backfilling they'll be backfilling
Perfect
I'll have backfilled you'll have backfilled he'll have backfilled we'll have backfilled you'll have backfilled they'll have backfilled
V-ing perfect
I'll have been backfilling you'll have been backfilling he'll have been backfilling we'll have been backfilling you'll have been backfilling they'll have been backfilling
Negation
Simple form
I shan't backfill you shan't backfill he shan't backfill we shan't backfill you shan't backfill they shan't backfill
V-ing form
I shan't be backfilling you shan't be backfilling he shan't be backfilling we shan't be backfilling you shan't be backfilling they shan't be backfilling
Perfect
I shan't have backfilled you shan't have backfilled he shan't have backfilled we shan't have backfilled you shan't have backfilled they shan't have backfilled
V-ing perfect
I shan't have been backfilling you shan't have been backfilling he shan't have been backfilling we shan't have been backfilling you shan't have been backfilling they shan't have been backfilling
Interrogative form
Simple form
shall I backfill? shall you backfill? shall he backfill? shall we backfill? shall you backfill? shall they backfill?
V-ing form
shall I be backfilling? shall you be backfilling? shall he be backfilling? shall we be backfilling? shall you be backfilling? shall they be backfilling?
Perfect
shall I have backfilled? shall you have backfilled? shall he have backfilled? shall we have backfilled? shall you have backfilled? shall they have backfilled?
V-ing perfect
shall I have been backfilling? shall you have been backfilling? shall he have been backfilling? shall we have been backfilling? shall you have been backfilling? shall they have been backfilling?
Interro-negative form
Simple form
shan't I backfill? shan't you backfill? shan't he backfill? shan't we backfill? shan't you backfill? shan't they backfill?
V-ing form
shan't I be backfilling? shan't you be backfilling? shan't he be backfilling? shan't we be backfilling? shan't you be backfilling? shan't they be backfilling?
Perfect
shan't I have backfilled? shan't you have backfilled? shan't he have backfilled? shan't we have backfilled? shan't you have backfilled? shan't they have backfilled?
V-ing perfect
shan't I have been backfilling? shan't you have been backfilling? shan't he have been backfilling? shan't we have been backfilling? shan't you have been backfilling? shan't they have been backfilling?