I could cost you could cost he could cost we could cost you could cost they could cost
Forma com V-ing
I could be costing you could be costing he could be costing we could be costing you could be costing they could be costing
Perfeito
I could have cost you could have cost he could have cost we could have cost you could have cost they could have cost
Perfeito com V-ing
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
Negação
Forma simple
I could not cost you could not cost he could not cost we could not cost you could not cost they could not cost
Forma com V-ing
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
Perfeito
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
Perfeito com V-ing
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
Forma interrogativa
Forma simple
could I cost? could you cost? could he cost? could we cost? could you cost? could they cost?
Forma com V-ing
could I be costing? could you be costing? could he be costing? could we be costing? could you be costing? could they be costing?
Perfeito
could I have cost? could you have cost? could he have cost? could we have cost? could you have cost? could they have cost?
Perfeito com V-ing
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?
Forma interro-Negação
Forma simple
could I not cost? could you not cost? could he not cost? could we not cost? could you not cost? could they not cost?
Forma com V-ing
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?
Perfeito
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?
Perfeito com V-ing
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?