can authenticate
Regular verb: authenticate - authenticated- authenticated

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can authenticate
you can authenticate
he can authenticate
we can authenticate
you can authenticate
they can authenticate 	I can be authenticating
you can be authenticating
he can be authenticating
we can be authenticating
you can be authenticating
they can be authenticating	I can have authenticated
you can have authenticated
he can have authenticated
we can have authenticated
you can have authenticated
they can have authenticated	I can have been authenticating
you can have been authenticating
he can have been authenticating
we can have been authenticating
you can have been authenticating
they can have been authenticating	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't authenticate
you can't authenticate
he can't authenticate
we can't authenticate
you can't authenticate
they can't authenticate 	I can't be authenticating
you can't be authenticating
he can't be authenticating
we can't be authenticating
you can't be authenticating
they can't be authenticating	I can't have authenticated
you can't have authenticated
he can't have authenticated
we can't have authenticated
you can't have authenticated
they can't have authenticated	I can't have been authenticating
you can't have been authenticating
he can't have been authenticating
we can't have been authenticating
you can't have been authenticating
they can't have been authenticating	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I authenticate?
can you authenticate?
can he authenticate?
can we authenticate?
can you authenticate?
can they authenticate? 	can I be authenticating?
can you be authenticating?
can he be authenticating?
can we be authenticating?
can you be authenticating?
can they be authenticating? 	can I have authenticated?
can you have authenticated?
can he have authenticated?
can we have authenticated?
can you have authenticated?
can they have authenticated? 	can I have been authenticating?
can you have been authenticating?
can he have been authenticating?
can we have been authenticating?
can you have been authenticating?
can they have been authenticating? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I authenticate?
can't you authenticate?
can't he authenticate?
can't we authenticate?
can't you authenticate?
can't they authenticate? 	can't I be authenticating?
can't you be authenticating?
can't he be authenticating?
can't we be authenticating?
can't you be authenticating?
can't they be authenticating? 	can't I have authenticated?
can't you have authenticated?
can't he have authenticated?
can't we have authenticated?
can't you have authenticated?
can't they have authenticated? 	can't I have been authenticating?
can't you have been authenticating?
can't he have been authenticating?
can't we have been authenticating?
can't you have been authenticating?
can't they have been authenticating?