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 can't ascertain you can't ascertain he can't ascertain we can't ascertain you can't ascertain they can't ascertain
Forma con V-ing
I can't be ascertaining you can't be ascertaining he can't be ascertaining we can't be ascertaining you can't be ascertaining they can't be ascertaining
Perfecto
I can't have ascertained you can't have ascertained he can't have ascertained we can't have ascertained you can't have ascertained they can't have ascertained
Perfecto con V-ing
I can't have been ascertaining you can't have been ascertaining he can't have been ascertaining we can't have been ascertaining you can't have been ascertaining they can't 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't I ascertain? can't you ascertain? can't he ascertain? can't we ascertain? can't you ascertain? can't they ascertain?
Forma con V-ing
can't I be ascertaining? can't you be ascertaining? can't he be ascertaining? can't we be ascertaining? can't you be ascertaining? can't they be ascertaining?
Perfecto
can't I have ascertained? can't you have ascertained? can't he have ascertained? can't we have ascertained? can't you have ascertained? can't they have ascertained?
Perfecto con V-ing
can't I have been ascertaining? can't you have been ascertaining? can't he have been ascertaining? can't we have been ascertaining? can't you have been ascertaining? can't they have been ascertaining?