English verb conjugation COULD COST

Irregular verb: cost - cost - cost


Affirmation

Simple form

I could cost
you could cost
he could cost
we could cost
you could cost
they could cost

V-ing form

I could be costing
you could be costing
he could be costing
we could be costing
you could be costing
they could be costing

Perfect

I could have cost
you could have cost
he could have cost
we could have cost
you could have cost
they could have cost

V-ing perfect

I could have been costing
you could have been costing
he could have been costing
we could have been costing
you could have been costing
they could have been costing

Negation

Simple form

I could not cost
you could not cost
he could not cost
we could not cost
you could not cost
they could not cost

V-ing form

I could not be costing
you could not be costing
he could not be costing
we could not be costing
you could not be costing
they could not be costing

Perfect

I could not have cost
you could not have cost
he could not have cost
we could not have cost
you could not have cost
they could not have cost

V-ing perfect

I could not have been costing
you could not have been costing
he could not have been costing
we could not have been costing
you could not have been costing
they could not have been costing

Interrogative form

Simple form

could I cost?
could you cost?
could he cost?
could we cost?
could you cost?
could they cost?

V-ing form

could I be costing?
could you be costing?
could he be costing?
could we be costing?
could you be costing?
could they be costing?

Perfect

could I have cost?
could you have cost?
could he have cost?
could we have cost?
could you have cost?
could they have cost?

V-ing perfect

could I have been costing?
could you have been costing?
could he have been costing?
could we have been costing?
could you have been costing?
could they have been costing?

Interro-negative form

Simple form

could I not cost?
could you not cost?
could he not cost?
could we not cost?
could you not cost?
could they not cost?

V-ing form

could I not be costing?
could you not be costing?
could he not be costing?
could we not be costing?
could you not be costing?
could they not be costing?

Perfect

could I not have cost?
could you not have cost?
could he not have cost?
could we not have cost?
could you not have cost?
could they not have cost?

V-ing perfect

could I not have been costing?
could you not have been costing?
could he not have been costing?
could we not have been costing?
could you not have been costing?
could they not have been costing?