English verb conjugation
MUST BARB

Regular verb: barb - barbed - barbed

Affirmation

Simple form	V-ing form
I must barb you must barb he must barb we must barb you must barb they must barb	I must be barbing you must be barbing he 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 he 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 he 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 he 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 he 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 he 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 he 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 he barb? must we barb? must you barb? must they barb?	must I be barbing? must you be barbing? must he 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 he 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 he 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 he 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 he 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 he 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 he have been barbing? mustn't we have been barbing? mustn't you have been barbing? mustn't they have been barbing?