English verb conjugation
CAN COST

Irregular verb: cost - cost - cost

Affirmation

Simple form	V-ing form
I can cost you can cost he can cost we can cost you can cost they can cost	I can be costing you can be costing he can be costing we can be costing you can be costing they can be costing
Perfect	V-ing perfect
I can have cost you can have cost he 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 he 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
I cannot cost you cannot cost he cannot cost we cannot cost you cannot cost they cannot cost	I cannot be costing you cannot be costing he cannot be costing we cannot be costing you cannot be costing they cannot be costing
Perfect	V-ing perfect
I cannot have cost you cannot have cost he cannot have cost we cannot have cost you cannot have cost they cannot have cost	I cannot have been costing you cannot have been costing he cannot have been costing we cannot have been costing you cannot have been costing they cannot have been costing

Interrogative form

Simple form	V-ing form
can I cost? can you cost? can he cost? can we cost? can you cost? can they cost?	can I be costing? can you be costing? can he be costing? can we be costing? can you be costing? can they be costing?
Perfect	V-ing perfect
can I have cost? can you have cost? can he 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 he 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
can I not cost? can you not cost? can he not cost? can we not cost? can you not cost? can they not cost?	can I not be costing? can you not be costing? can he not be costing? can we not be costing? can you not be costing? can they not be costing?
Perfect	V-ing perfect
can I not have cost? can you not have cost? can he not have cost? can we not have cost? can you not have cost? can they not have cost?	can I not have been costing? can you not have been costing? can he not have been costing? can we not have been costing? can you not have been costing? can they not have been costing?