Conjugação do verbo inglês
CAN ASCERTAIN

Verbo regular: ascertain - ascertained - ascertained

Afirmação

Forma simple	Forma com V-ing
I can ascertain you can ascertain he can ascertain we can ascertain you can ascertain they can ascertain	I can be ascertaining you can be ascertaining he can be ascertaining we can be ascertaining you can be ascertaining they can be ascertaining
Perfeito	Perfeito com V-ing
I can have ascertained you can have ascertained he 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 he can have been ascertaining we can have been ascertaining you can have been ascertaining they can have been ascertaining

Negação

Forma simple	Forma com V-ing
I can't ascertain you can't ascertain he 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 he can't be ascertaining we can't be ascertaining you can't be ascertaining they can't be ascertaining
Perfeito	Perfeito com V-ing
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	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	Forma com V-ing
can I ascertain? can you ascertain? can he ascertain? can we ascertain? can you ascertain? can they ascertain?	can I be ascertaining? can you be ascertaining? can he be ascertaining? can we be ascertaining? can you be ascertaining? can they be ascertaining?
Perfeito	Perfeito com V-ing
can I have ascertained? can you have ascertained? can he 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 he have been ascertaining? can we have been ascertaining? can you have been ascertaining? can they have been ascertaining?

Forma interro-Negação

Forma simple	Forma com V-ing
can't I ascertain? can't you ascertain? can't he 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 he be ascertaining? can't we be ascertaining? can't you be ascertaining? can't they be ascertaining?
Perfeito	Perfeito com V-ing
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?	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?