I'd be costing you'd be costing she'd be costing we'd be costing you'd be costing they'd be costing
Perfect
I should've cost you should've cost she should've cost we should've cost you should've cost they should've cost
V-ing perfect
I should've been costing you should've been costing she should've been costing we should've been costing you should've been costing they should've been costing
Negation
Simple form
I shouldn't cost you shouldn't cost she shouldn't cost we shouldn't cost you shouldn't cost they shouldn't cost
V-ing form
I shouldn't be costing you shouldn't be costing she shouldn't be costing we shouldn't be costing you shouldn't be costing they shouldn't be costing
Perfect
I shouldn't have cost you shouldn't have cost she shouldn't have cost we shouldn't have cost you shouldn't have cost they shouldn't have cost
V-ing perfect
I shouldn't have been costing you shouldn't have been costing she shouldn't have been costing we shouldn't have been costing you shouldn't have been costing they shouldn't have been costing
Interrogative form
Simple form
should I cost? should you cost? should she cost? should we cost? should you cost? should they cost?
V-ing form
should I be costing? should you be costing? should she be costing? should we be costing? should you be costing? should they be costing?
Perfect
should I have cost? should you have cost? should she have cost? should we have cost? should you have cost? should they have cost?
V-ing perfect
should I have been costing? should you have been costing? should she have been costing? should we have been costing? should you have been costing? should they have been costing?
Interro-negative form
Simple form
shouldn't I cost? shouldn't you cost? shouldn't she cost? shouldn't we cost? shouldn't you cost? shouldn't they cost?
V-ing form
shouldn't I be costing? shouldn't you be costing? shouldn't she be costing? shouldn't we be costing? shouldn't you be costing? shouldn't they be costing?
Perfect
shouldn't I have cost? shouldn't you have cost? shouldn't she have cost? shouldn't we have cost? shouldn't you have cost? shouldn't they have cost?
V-ing perfect
shouldn't I have been costing? shouldn't you have been costing? shouldn't she have been costing? shouldn't we have been costing? shouldn't you have been costing? shouldn't they have been costing?