must persevere
Regular verb: persevere - persevered- persevered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must persevere
you must persevere
she must persevere
we must persevere
you must persevere
they must persevere 	I must be persevering
you must be persevering
she must be persevering
we must be persevering
you must be persevering
they must be persevering	I must have persevered
you must have persevered
she 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
she 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
she 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
she 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
she 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
she 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 she persevere?
must we persevere?
must you persevere?
must they persevere? 	must I be persevering?
must you be persevering?
must she be persevering?
must we be persevering?
must you be persevering?
must they be persevering? 	must I have persevered?
must you have persevered?
must she 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 she 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 she 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 she 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 she 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 she have been persevering?
mustn't we have been persevering?
mustn't you have been persevering?
mustn't they have been persevering?