I'll be costing you'll be costing she'll be costing we'll be costing you'll be costing they'll be costing
Perfect
I'll have cost you'll have cost she'll have cost we'll have cost you'll have cost they'll have cost
V-ing perfect
I'll have been costing you'll have been costing she'll have been costing we'll have been costing you'll have been costing they'll have been costing
Negation
Simple form
I shan't cost you shan't cost she shan't cost we shan't cost you shan't cost they shan't cost
V-ing form
I shan't be costing you shan't be costing she shan't be costing we shan't be costing you shan't be costing they shan't be costing
Perfect
I shan't have cost you shan't have cost she shan't have cost we shan't have cost you shan't have cost they shan't have cost
V-ing perfect
I shan't have been costing you shan't have been costing she shan't have been costing we shan't have been costing you shan't have been costing they shan't have been costing
Interrogative form
Simple form
shall I cost? shall you cost? shall she cost? shall we cost? shall you cost? shall they cost?
V-ing form
shall I be costing? shall you be costing? shall she be costing? shall we be costing? shall you be costing? shall they be costing?
Perfect
shall I have cost? shall you have cost? shall she have cost? shall we have cost? shall you have cost? shall they have cost?
V-ing perfect
shall I have been costing? shall you have been costing? shall she have been costing? shall we have been costing? shall you have been costing? shall they have been costing?
Interro-negative form
Simple form
shan't I cost? shan't you cost? shan't she cost? shan't we cost? shan't you cost? shan't they cost?
V-ing form
shan't I be costing? shan't you be costing? shan't she be costing? shan't we be costing? shan't you be costing? shan't they be costing?
Perfect
shan't I have cost? shan't you have cost? shan't she have cost? shan't we have cost? shan't you have cost? shan't they have cost?
V-ing perfect
shan't I have been costing? shan't you have been costing? shan't she have been costing? shan't we have been costing? shan't you have been costing? shan't they have been costing?