English verb conjugation
MUST BARB

Regular verb: barb - barbed - barbed

Affirmation

Simple form	V-ing form
I must barb you must barb she must barb we must barb you must barb they must barb	I must be barbing you must be barbing she must be barbing we must be barbing you must be barbing they must be barbing
Perfect	V-ing perfect
I must have barbed you must have barbed she must have barbed we must have barbed you must have barbed they must have barbed	I must have been barbing you must have been barbing she must have been barbing we must have been barbing you must have been barbing they must have been barbing

Negation

Simple form	V-ing form
I mustn't barb you mustn't barb she mustn't barb we mustn't barb you mustn't barb they mustn't barb	I mustn't be barbing you mustn't be barbing she mustn't be barbing we mustn't be barbing you mustn't be barbing they mustn't be barbing
Perfect	V-ing perfect
I mustn't have barbed you mustn't have barbed she mustn't have barbed we mustn't have barbed you mustn't have barbed they mustn't have barbed	I mustn't have been barbing you mustn't have been barbing she mustn't have been barbing we mustn't have been barbing you mustn't have been barbing they mustn't have been barbing

Interrogative form

Simple form	V-ing form
must I barb? must you barb? must she barb? must we barb? must you barb? must they barb?	must I be barbing? must you be barbing? must she be barbing? must we be barbing? must you be barbing? must they be barbing?
Perfect	V-ing perfect
must I have barbed? must you have barbed? must she have barbed? must we have barbed? must you have barbed? must they have barbed?	must I have been barbing? must you have been barbing? must she have been barbing? must we have been barbing? must you have been barbing? must they have been barbing?

Interro-negative form

Simple form	V-ing form
mustn't I barb? mustn't you barb? mustn't she barb? mustn't we barb? mustn't you barb? mustn't they barb?	mustn't I be barbing? mustn't you be barbing? mustn't she be barbing? mustn't we be barbing? mustn't you be barbing? mustn't they be barbing?
Perfect	V-ing perfect
mustn't I have barbed? mustn't you have barbed? mustn't she have barbed? mustn't we have barbed? mustn't you have barbed? mustn't they have barbed?	mustn't I have been barbing? mustn't you have been barbing? mustn't she have been barbing? mustn't we have been barbing? mustn't you have been barbing? mustn't they have been barbing?