could authenticate
Verbo regolare: authenticate - authenticated- authenticated

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could authenticate
you could authenticate
she could authenticate
we could authenticate
you could authenticate
they could authenticate 	I could be authenticating
you could be authenticating
she could be authenticating
we could be authenticating
you could be authenticating
they could be authenticating	I could have authenticated
you could have authenticated
she could have authenticated
we could have authenticated
you could have authenticated
they could have authenticated	I could have been authenticating
you could have been authenticating
she could have been authenticating
we could have been authenticating
you could have been authenticating
they could have been authenticating	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not authenticate
you could not authenticate
she could not authenticate
we could not authenticate
you could not authenticate
they could not authenticate 	I could not be authenticating
you could not be authenticating
she could not be authenticating
we could not be authenticating
you could not be authenticating
they could not be authenticating	I could not have authenticated
you could not have authenticated
she could not have authenticated
we could not have authenticated
you could not have authenticated
they could not have authenticated	I could not have been authenticating
you could not have been authenticating
she could not have been authenticating
we could not have been authenticating
you could not have been authenticating
they could not have been authenticating	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I authenticate?
could you authenticate?
could she authenticate?
could we authenticate?
could you authenticate?
could they authenticate? 	could I be authenticating?
could you be authenticating?
could she be authenticating?
could we be authenticating?
could you be authenticating?
could they be authenticating? 	could I have authenticated?
could you have authenticated?
could she have authenticated?
could we have authenticated?
could you have authenticated?
could they have authenticated? 	could I have been authenticating?
could you have been authenticating?
could she have been authenticating?
could we have been authenticating?
could you have been authenticating?
could they have been authenticating? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not authenticate?
could you not authenticate?
could she not authenticate?
could we not authenticate?
could you not authenticate?
could they not authenticate? 	could I not be authenticating?
could you not be authenticating?
could she not be authenticating?
could we not be authenticating?
could you not be authenticating?
could they not be authenticating? 	could I not have authenticated?
could you not have authenticated?
could she not have authenticated?
could we not have authenticated?
could you not have authenticated?
could they not have authenticated? 	could I not have been authenticating?
could you not have been authenticating?
could she not have been authenticating?
could we not have been authenticating?
could you not have been authenticating?
could they not have been authenticating?