English verb conjugation
SHOULD COST

Irregular verb: cost - cost - cost

Affirmation

Simple form	V-ing form
I'd cost you'd cost he'd cost we'd cost you'd cost they'd cost	I'd be costing you'd be costing he'd be costing we'd be costing you'd be costing they'd be costing
Perfect	V-ing perfect
I should've cost you should've cost he should've cost we should've cost you should've cost they should've cost	I should've been costing you should've been costing he should've been costing we should've been costing you should've been costing they should've been costing

Negation

Simple form	V-ing form
I shouldn't cost you shouldn't cost he shouldn't cost we shouldn't cost you shouldn't cost they shouldn't cost	I shouldn't be costing you shouldn't be costing he shouldn't be costing we shouldn't be costing you shouldn't be costing they shouldn't be costing
Perfect	V-ing perfect
I shouldn't have cost you shouldn't have cost he shouldn't have cost we shouldn't have cost you shouldn't have cost they shouldn't have cost	I shouldn't have been costing you shouldn't have been costing he 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	V-ing form
should I cost? should you cost? should he cost? should we cost? should you cost? should they cost?	should I be costing? should you be costing? should he be costing? should we be costing? should you be costing? should they be costing?
Perfect	V-ing perfect
should I have cost? should you have cost? should he have cost? should we have cost? should you have cost? should they have cost?	should I have been costing? should you have been costing? should he have been costing? should we have been costing? should you have been costing? should they have been costing?

Interro-negative form

Simple form	V-ing form
shouldn't I cost? shouldn't you cost? shouldn't he cost? shouldn't we cost? shouldn't you cost? shouldn't they cost?	shouldn't I be costing? shouldn't you be costing? shouldn't he be costing? shouldn't we be costing? shouldn't you be costing? shouldn't they be costing?
Perfect	V-ing perfect
shouldn't I have cost? shouldn't you have cost? shouldn't he have cost? shouldn't we have cost? shouldn't you have cost? shouldn't they have cost?	shouldn't I have been costing? shouldn't you have been costing? shouldn't he have been costing? shouldn't we have been costing? shouldn't you have been costing? shouldn't they have been costing?