Conjugação do verbo inglês
COULD CERTIFY

Verbo regular: certify - certified - certified

Afirmação

Forma simple	Forma com V-ing
I could certify you could certify he could certify we could certify you could certify they could certify	I could be certifying you could be certifying he could be certifying we could be certifying you could be certifying they could be certifying
Perfeito	Perfeito com V-ing
I could have certified you could have certified he could have certified we could have certified you could have certified they could have certified	I could have been certifying you could have been certifying he could have been certifying we could have been certifying you could have been certifying they could have been certifying

Negação

Forma simple	Forma com V-ing
I could not certify you could not certify he could not certify we could not certify you could not certify they could not certify	I could not be certifying you could not be certifying he could not be certifying we could not be certifying you could not be certifying they could not be certifying
Perfeito	Perfeito com V-ing
I could not have certified you could not have certified he could not have certified we could not have certified you could not have certified they could not have certified	I could not have been certifying you could not have been certifying he could not have been certifying we could not have been certifying you could not have been certifying they could not have been certifying

Forma interrogativa

Forma simple	Forma com V-ing
could I certify? could you certify? could he certify? could we certify? could you certify? could they certify?	could I be certifying? could you be certifying? could he be certifying? could we be certifying? could you be certifying? could they be certifying?
Perfeito	Perfeito com V-ing
could I have certified? could you have certified? could he have certified? could we have certified? could you have certified? could they have certified?	could I have been certifying? could you have been certifying? could he have been certifying? could we have been certifying? could you have been certifying? could they have been certifying?

Forma interro-Negação

Forma simple	Forma com V-ing
could I not certify? could you not certify? could he not certify? could we not certify? could you not certify? could they not certify?	could I not be certifying? could you not be certifying? could he not be certifying? could we not be certifying? could you not be certifying? could they not be certifying?
Perfeito	Perfeito com V-ing
could I not have certified? could you not have certified? could he not have certified? could we not have certified? could you not have certified? could they not have certified?	could I not have been certifying? could you not have been certifying? could he not have been certifying? could we not have been certifying? could you not have been certifying? could they not have been certifying?