may authenticate
Regular verb: authenticate - authenticated- authenticated

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

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

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

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