must persist
Regular verb: persist - persisted- persisted

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must persist
you must persist
she must persist
we must persist
you must persist
they must persist 	I must be persisting
you must be persisting
she must be persisting
we must be persisting
you must be persisting
they must be persisting	I must have persisted
you must have persisted
she must have persisted
we must have persisted
you must have persisted
they must have persisted	I must have been persisting
you must have been persisting
she must have been persisting
we must have been persisting
you must have been persisting
they must have been persisting	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't persist
you mustn't persist
she mustn't persist
we mustn't persist
you mustn't persist
they mustn't persist 	I mustn't be persisting
you mustn't be persisting
she mustn't be persisting
we mustn't be persisting
you mustn't be persisting
they mustn't be persisting	I mustn't have persisted
you mustn't have persisted
she mustn't have persisted
we mustn't have persisted
you mustn't have persisted
they mustn't have persisted	I mustn't have been persisting
you mustn't have been persisting
she mustn't have been persisting
we mustn't have been persisting
you mustn't have been persisting
they mustn't have been persisting	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I persist?
must you persist?
must she persist?
must we persist?
must you persist?
must they persist? 	must I be persisting?
must you be persisting?
must she be persisting?
must we be persisting?
must you be persisting?
must they be persisting? 	must I have persisted?
must you have persisted?
must she have persisted?
must we have persisted?
must you have persisted?
must they have persisted? 	must I have been persisting?
must you have been persisting?
must she have been persisting?
must we have been persisting?
must you have been persisting?
must they have been persisting? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I persist?
mustn't you persist?
mustn't she persist?
mustn't we persist?
mustn't you persist?
mustn't they persist? 	mustn't I be persisting?
mustn't you be persisting?
mustn't she be persisting?
mustn't we be persisting?
mustn't you be persisting?
mustn't they be persisting? 	mustn't I have persisted?
mustn't you have persisted?
mustn't she have persisted?
mustn't we have persisted?
mustn't you have persisted?
mustn't they have persisted? 	mustn't I have been persisting?
mustn't you have been persisting?
mustn't she have been persisting?
mustn't we have been persisting?
mustn't you have been persisting?
mustn't they have been persisting?