must imprison
Regular verb: imprison - imprisoned- imprisoned

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must imprison
you must imprison
she must imprison
we must imprison
you must imprison
they must imprison 	I must be imprisoning
you must be imprisoning
she must be imprisoning
we must be imprisoning
you must be imprisoning
they must be imprisoning	I must have imprisoned
you must have imprisoned
she must have imprisoned
we must have imprisoned
you must have imprisoned
they must have imprisoned	I must have been imprisoning
you must have been imprisoning
she must have been imprisoning
we must have been imprisoning
you must have been imprisoning
they must have been imprisoning	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't imprison
you mustn't imprison
she mustn't imprison
we mustn't imprison
you mustn't imprison
they mustn't imprison 	I mustn't be imprisoning
you mustn't be imprisoning
she mustn't be imprisoning
we mustn't be imprisoning
you mustn't be imprisoning
they mustn't be imprisoning	I mustn't have imprisoned
you mustn't have imprisoned
she mustn't have imprisoned
we mustn't have imprisoned
you mustn't have imprisoned
they mustn't have imprisoned	I mustn't have been imprisoning
you mustn't have been imprisoning
she mustn't have been imprisoning
we mustn't have been imprisoning
you mustn't have been imprisoning
they mustn't have been imprisoning	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I imprison?
must you imprison?
must she imprison?
must we imprison?
must you imprison?
must they imprison? 	must I be imprisoning?
must you be imprisoning?
must she be imprisoning?
must we be imprisoning?
must you be imprisoning?
must they be imprisoning? 	must I have imprisoned?
must you have imprisoned?
must she have imprisoned?
must we have imprisoned?
must you have imprisoned?
must they have imprisoned? 	must I have been imprisoning?
must you have been imprisoning?
must she have been imprisoning?
must we have been imprisoning?
must you have been imprisoning?
must they have been imprisoning? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I imprison?
mustn't you imprison?
mustn't she imprison?
mustn't we imprison?
mustn't you imprison?
mustn't they imprison? 	mustn't I be imprisoning?
mustn't you be imprisoning?
mustn't she be imprisoning?
mustn't we be imprisoning?
mustn't you be imprisoning?
mustn't they be imprisoning? 	mustn't I have imprisoned?
mustn't you have imprisoned?
mustn't she have imprisoned?
mustn't we have imprisoned?
mustn't you have imprisoned?
mustn't they have imprisoned? 	mustn't I have been imprisoning?
mustn't you have been imprisoning?
mustn't she have been imprisoning?
mustn't we have been imprisoning?
mustn't you have been imprisoning?
mustn't they have been imprisoning?