can cost
Irregular verb: cost - cost- cost

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can cost
you can cost
she can cost
we can cost
you can cost
they can cost 	I can be costing
you can be costing
she can be costing
we can be costing
you can be costing
they can be costing	I can have cost
you can have cost
she can have cost
we can have cost
you can have cost
they can have cost	I can have been costing
you can have been costing
she can have been costing
we can have been costing
you can have been costing
they can have been costing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't cost
you can't cost
she can't cost
we can't cost
you can't cost
they can't cost 	I can't be costing
you can't be costing
she can't be costing
we can't be costing
you can't be costing
they can't be costing	I can't have cost
you can't have cost
she can't have cost
we can't have cost
you can't have cost
they can't have cost	I can't have been costing
you can't have been costing
she can't have been costing
we can't have been costing
you can't have been costing
they can't have been costing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I cost?
can you cost?
can she cost?
can we cost?
can you cost?
can they cost? 	can I be costing?
can you be costing?
can she be costing?
can we be costing?
can you be costing?
can they be costing? 	can I have cost?
can you have cost?
can she have cost?
can we have cost?
can you have cost?
can they have cost? 	can I have been costing?
can you have been costing?
can she have been costing?
can we have been costing?
can you have been costing?
can they have been costing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I cost?
can't you cost?
can't she cost?
can't we cost?
can't you cost?
can't they cost? 	can't I be costing?
can't you be costing?
can't she be costing?
can't we be costing?
can't you be costing?
can't they be costing? 	can't I have cost?
can't you have cost?
can't she have cost?
can't we have cost?
can't you have cost?
can't they have cost? 	can't I have been costing?
can't you have been costing?
can't she have been costing?
can't we have been costing?
can't you have been costing?
can't they have been costing?