must gull
Regular verb: gull - gulled- gulled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must gull
you must gull
he must gull
we must gull
you must gull
they must gull 	I must be gulling
you must be gulling
he must be gulling
we must be gulling
you must be gulling
they must be gulling	I must have gulled
you must have gulled
he must have gulled
we must have gulled
you must have gulled
they must have gulled	I must have been gulling
you must have been gulling
he must have been gulling
we must have been gulling
you must have been gulling
they must have been gulling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't gull
you mustn't gull
he mustn't gull
we mustn't gull
you mustn't gull
they mustn't gull 	I mustn't be gulling
you mustn't be gulling
he mustn't be gulling
we mustn't be gulling
you mustn't be gulling
they mustn't be gulling	I mustn't have gulled
you mustn't have gulled
he mustn't have gulled
we mustn't have gulled
you mustn't have gulled
they mustn't have gulled	I mustn't have been gulling
you mustn't have been gulling
he mustn't have been gulling
we mustn't have been gulling
you mustn't have been gulling
they mustn't have been gulling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I gull?
must you gull?
must he gull?
must we gull?
must you gull?
must they gull? 	must I be gulling?
must you be gulling?
must he be gulling?
must we be gulling?
must you be gulling?
must they be gulling? 	must I have gulled?
must you have gulled?
must he have gulled?
must we have gulled?
must you have gulled?
must they have gulled? 	must I have been gulling?
must you have been gulling?
must he have been gulling?
must we have been gulling?
must you have been gulling?
must they have been gulling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I gull?
mustn't you gull?
mustn't he gull?
mustn't we gull?
mustn't you gull?
mustn't they gull? 	mustn't I be gulling?
mustn't you be gulling?
mustn't he be gulling?
mustn't we be gulling?
mustn't you be gulling?
mustn't they be gulling? 	mustn't I have gulled?
mustn't you have gulled?
mustn't he have gulled?
mustn't we have gulled?
mustn't you have gulled?
mustn't they have gulled? 	mustn't I have been gulling?
mustn't you have been gulling?
mustn't he have been gulling?
mustn't we have been gulling?
mustn't you have been gulling?
mustn't they have been gulling?