Conjugación del verbo inglés
CAN ASCERTAIN

Verbo regular: ascertain - ascertained - ascertained

Afirmación

Forma simple	Forma con V-ing
I can ascertain you can ascertain she can ascertain we can ascertain you can ascertain they can ascertain	I can be ascertaining you can be ascertaining she can be ascertaining we can be ascertaining you can be ascertaining they can be ascertaining
Perfecto	Perfecto con V-ing
I can have ascertained you can have ascertained she can have ascertained we can have ascertained you can have ascertained they can have ascertained	I can have been ascertaining you can have been ascertaining she can have been ascertaining we can have been ascertaining you can have been ascertaining they can have been ascertaining

Negación

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

Forma interro-negativa

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