Verbo regular: ascertain - ascertained - ascertained
Afirmação
Forma simple
I could ascertain you could ascertain he could ascertain we could ascertain you could ascertain they could ascertain
Forma com V-ing
I could be ascertaining you could be ascertaining he could be ascertaining we could be ascertaining you could be ascertaining they could be ascertaining
Perfeito
I could have ascertained you could have ascertained he could have ascertained we could have ascertained you could have ascertained they could have ascertained
Perfeito com V-ing
I could have been ascertaining you could have been ascertaining he could have been ascertaining we could have been ascertaining you could have been ascertaining they could have been ascertaining
Negação
Forma simple
I could not ascertain you could not ascertain he could not ascertain we could not ascertain you could not ascertain they could not ascertain
Forma com V-ing
I could not be ascertaining you could not be ascertaining he could not be ascertaining we could not be ascertaining you could not be ascertaining they could not be ascertaining
Perfeito
I could not have ascertained you could not have ascertained he could not have ascertained we could not have ascertained you could not have ascertained they could not have ascertained
Perfeito com V-ing
I could not have been ascertaining you could not have been ascertaining he could not have been ascertaining we could not have been ascertaining you could not have been ascertaining they could not have been ascertaining
Forma interrogativa
Forma simple
could I ascertain? could you ascertain? could he ascertain? could we ascertain? could you ascertain? could they ascertain?
Forma com V-ing
could I be ascertaining? could you be ascertaining? could he be ascertaining? could we be ascertaining? could you be ascertaining? could they be ascertaining?
Perfeito
could I have ascertained? could you have ascertained? could he have ascertained? could we have ascertained? could you have ascertained? could they have ascertained?
Perfeito com V-ing
could I have been ascertaining? could you have been ascertaining? could he have been ascertaining? could we have been ascertaining? could you have been ascertaining? could they have been ascertaining?
Forma interro-Negação
Forma simple
could I not ascertain? could you not ascertain? could he not ascertain? could we not ascertain? could you not ascertain? could they not ascertain?
Forma com V-ing
could I not be ascertaining? could you not be ascertaining? could he not be ascertaining? could we not be ascertaining? could you not be ascertaining? could they not be ascertaining?
Perfeito
could I not have ascertained? could you not have ascertained? could he not have ascertained? could we not have ascertained? could you not have ascertained? could they not have ascertained?
Perfeito com V-ing
could I not have been ascertaining? could you not have been ascertaining? could he not have been ascertaining? could we not have been ascertaining? could you not have been ascertaining? could they not have been ascertaining?