must persevere
Regular verb: persevere - persevered- persevered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must persevere
you must persevere
he must persevere
we must persevere
you must persevere
they must persevere 	I must be persevering
you must be persevering
he must be persevering
we must be persevering
you must be persevering
they must be persevering	I must have persevered
you must have persevered
he must have persevered
we must have persevered
you must have persevered
they must have persevered	I must have been persevering
you must have been persevering
he must have been persevering
we must have been persevering
you must have been persevering
they must have been persevering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't persevere
you mustn't persevere
he mustn't persevere
we mustn't persevere
you mustn't persevere
they mustn't persevere 	I mustn't be persevering
you mustn't be persevering
he mustn't be persevering
we mustn't be persevering
you mustn't be persevering
they mustn't be persevering	I mustn't have persevered
you mustn't have persevered
he mustn't have persevered
we mustn't have persevered
you mustn't have persevered
they mustn't have persevered	I mustn't have been persevering
you mustn't have been persevering
he mustn't have been persevering
we mustn't have been persevering
you mustn't have been persevering
they mustn't have been persevering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I persevere?
must you persevere?
must he persevere?
must we persevere?
must you persevere?
must they persevere? 	must I be persevering?
must you be persevering?
must he be persevering?
must we be persevering?
must you be persevering?
must they be persevering? 	must I have persevered?
must you have persevered?
must he have persevered?
must we have persevered?
must you have persevered?
must they have persevered? 	must I have been persevering?
must you have been persevering?
must he have been persevering?
must we have been persevering?
must you have been persevering?
must they have been persevering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I persevere?
mustn't you persevere?
mustn't he persevere?
mustn't we persevere?
mustn't you persevere?
mustn't they persevere? 	mustn't I be persevering?
mustn't you be persevering?
mustn't he be persevering?
mustn't we be persevering?
mustn't you be persevering?
mustn't they be persevering? 	mustn't I have persevered?
mustn't you have persevered?
mustn't he have persevered?
mustn't we have persevered?
mustn't you have persevered?
mustn't they have persevered? 	mustn't I have been persevering?
mustn't you have been persevering?
mustn't he have been persevering?
mustn't we have been persevering?
mustn't you have been persevering?
mustn't they have been persevering?