can ascertain
Verbo regolare: ascertain - ascertained- ascertained

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto 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	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	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I cannot ascertain
you cannot ascertain
she cannot ascertain
we cannot ascertain
you cannot ascertain
they cannot ascertain 	I cannot be ascertaining
you cannot be ascertaining
she cannot be ascertaining
we cannot be ascertaining
you cannot be ascertaining
they cannot be ascertaining	I cannot have ascertained
you cannot have ascertained
she cannot have ascertained
we cannot have ascertained
you cannot have ascertained
they cannot have ascertained	I cannot have been ascertaining
you cannot have been ascertaining
she cannot have been ascertaining
we cannot have been ascertaining
you cannot have been ascertaining
they cannot have been ascertaining	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto 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? 	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 semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
can I not ascertain?
can you not ascertain?
can she not ascertain?
can we not ascertain?
can you not ascertain?
can they not ascertain? 	can I not be ascertaining?
can you not be ascertaining?
can she not be ascertaining?
can we not be ascertaining?
can you not be ascertaining?
can they not be ascertaining? 	can I not have ascertained?
can you not have ascertained?
can she not have ascertained?
can we not have ascertained?
can you not have ascertained?
can they not have ascertained? 	can I not have been ascertaining?
can you not have been ascertaining?
can she not have been ascertaining?
can we not have been ascertaining?
can you not have been ascertaining?
can they not have been ascertaining?