must barb
Regular verb: barb - barbed- barbed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?