should cost
Irregular verb: cost - cost- cost

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?