must fissure
Regular verb: fissure - fissured- fissured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must fissure
you must fissure
he must fissure
we must fissure
you must fissure
they must fissure 	I must be fissuring
you must be fissuring
he must be fissuring
we must be fissuring
you must be fissuring
they must be fissuring	I must have fissured
you must have fissured
he must have fissured
we must have fissured
you must have fissured
they must have fissured	I must have been fissuring
you must have been fissuring
he must have been fissuring
we must have been fissuring
you must have been fissuring
they must have been fissuring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't fissure
you mustn't fissure
he mustn't fissure
we mustn't fissure
you mustn't fissure
they mustn't fissure 	I mustn't be fissuring
you mustn't be fissuring
he mustn't be fissuring
we mustn't be fissuring
you mustn't be fissuring
they mustn't be fissuring	I mustn't have fissured
you mustn't have fissured
he mustn't have fissured
we mustn't have fissured
you mustn't have fissured
they mustn't have fissured	I mustn't have been fissuring
you mustn't have been fissuring
he mustn't have been fissuring
we mustn't have been fissuring
you mustn't have been fissuring
they mustn't have been fissuring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I fissure?
must you fissure?
must he fissure?
must we fissure?
must you fissure?
must they fissure? 	must I be fissuring?
must you be fissuring?
must he be fissuring?
must we be fissuring?
must you be fissuring?
must they be fissuring? 	must I have fissured?
must you have fissured?
must he have fissured?
must we have fissured?
must you have fissured?
must they have fissured? 	must I have been fissuring?
must you have been fissuring?
must he have been fissuring?
must we have been fissuring?
must you have been fissuring?
must they have been fissuring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I fissure?
mustn't you fissure?
mustn't he fissure?
mustn't we fissure?
mustn't you fissure?
mustn't they fissure? 	mustn't I be fissuring?
mustn't you be fissuring?
mustn't he be fissuring?
mustn't we be fissuring?
mustn't you be fissuring?
mustn't they be fissuring? 	mustn't I have fissured?
mustn't you have fissured?
mustn't he have fissured?
mustn't we have fissured?
mustn't you have fissured?
mustn't they have fissured? 	mustn't I have been fissuring?
mustn't you have been fissuring?
mustn't he have been fissuring?
mustn't we have been fissuring?
mustn't you have been fissuring?
mustn't they have been fissuring?