Verbo regular: ascertain - ascertained - ascertained
Afirmación
Forma simple
I can ascertain you can ascertain he can ascertain we can ascertain you can ascertain they can ascertain
Forma con V-ing
I can be ascertaining you can be ascertaining he can be ascertaining we can be ascertaining you can be ascertaining they can be ascertaining
Perfecto
I can have ascertained you can have ascertained he can have ascertained we can have ascertained you can have ascertained they can have ascertained
Perfecto con V-ing
I can have been ascertaining you can have been ascertaining he can have been ascertaining we can have been ascertaining you can have been ascertaining they can have been ascertaining
Negación
Forma simple
I cannot ascertain you cannot ascertain he cannot ascertain we cannot ascertain you cannot ascertain they cannot ascertain
Forma con V-ing
I cannot be ascertaining you cannot be ascertaining he cannot be ascertaining we cannot be ascertaining you cannot be ascertaining they cannot be ascertaining
Perfecto
I cannot have ascertained you cannot have ascertained he cannot have ascertained we cannot have ascertained you cannot have ascertained they cannot have ascertained
Perfecto con V-ing
I cannot have been ascertaining you cannot have been ascertaining he cannot have been ascertaining we cannot have been ascertaining you cannot have been ascertaining they cannot have been ascertaining
Forma interrogativa
Forma simple
can I ascertain? can you ascertain? can he ascertain? can we ascertain? can you ascertain? can they ascertain?
Forma con V-ing
can I be ascertaining? can you be ascertaining? can he be ascertaining? can we be ascertaining? can you be ascertaining? can they be ascertaining?
Perfecto
can I have ascertained? can you have ascertained? can he have ascertained? can we have ascertained? can you have ascertained? can they have ascertained?
Perfecto con V-ing
can I have been ascertaining? can you have been ascertaining? can he have been ascertaining? can we have been ascertaining? can you have been ascertaining? can they have been ascertaining?
Forma interro-negativa
Forma simple
can I not ascertain? can you not ascertain? can he not ascertain? can we not ascertain? can you not ascertain? can they not ascertain?
Forma con V-ing
can I not be ascertaining? can you not be ascertaining? can he not be ascertaining? can we not be ascertaining? can you not be ascertaining? can they not be ascertaining?
Perfecto
can I not have ascertained? can you not have ascertained? can he not have ascertained? can we not have ascertained? can you not have ascertained? can they not have ascertained?
Perfecto con V-ing
can I not have been ascertaining? can you not have been ascertaining? can he not have been ascertaining? can we not have been ascertaining? can you not have been ascertaining? can they not have been ascertaining?