English verb conjugation
SHOULD AUTHENTICATE

Regular verb: authenticate - authenticated - authenticated

Affirmation

Simple form	V-ing form
I'd authenticate you'd authenticate she'd authenticate we'd authenticate you'd authenticate they'd authenticate	I'd be authenticating you'd be authenticating she'd be authenticating we'd be authenticating you'd be authenticating they'd be authenticating
Perfect	V-ing perfect
I should've authenticated you should've authenticated she should've authenticated we should've authenticated you should've authenticated they should've authenticated	I should've been authenticating you should've been authenticating she should've been authenticating we should've been authenticating you should've been authenticating they should've been authenticating

Negation

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

Interrogative form

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

Interro-negative form

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