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