English verb conjugation
MUST AUTHENTICATE

Regular verb: authenticate - authenticated - authenticated

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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