must cuff
Regular verb: cuff - cuffed- cuffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must cuff
you must cuff
she must cuff
we must cuff
you must cuff
they must cuff 	I must be cuffing
you must be cuffing
she must be cuffing
we must be cuffing
you must be cuffing
they must be cuffing	I must have cuffed
you must have cuffed
she must have cuffed
we must have cuffed
you must have cuffed
they must have cuffed	I must have been cuffing
you must have been cuffing
she must have been cuffing
we must have been cuffing
you must have been cuffing
they must have been cuffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't cuff
you mustn't cuff
she mustn't cuff
we mustn't cuff
you mustn't cuff
they mustn't cuff 	I mustn't be cuffing
you mustn't be cuffing
she mustn't be cuffing
we mustn't be cuffing
you mustn't be cuffing
they mustn't be cuffing	I mustn't have cuffed
you mustn't have cuffed
she mustn't have cuffed
we mustn't have cuffed
you mustn't have cuffed
they mustn't have cuffed	I mustn't have been cuffing
you mustn't have been cuffing
she mustn't have been cuffing
we mustn't have been cuffing
you mustn't have been cuffing
they mustn't have been cuffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I cuff?
must you cuff?
must she cuff?
must we cuff?
must you cuff?
must they cuff? 	must I be cuffing?
must you be cuffing?
must she be cuffing?
must we be cuffing?
must you be cuffing?
must they be cuffing? 	must I have cuffed?
must you have cuffed?
must she have cuffed?
must we have cuffed?
must you have cuffed?
must they have cuffed? 	must I have been cuffing?
must you have been cuffing?
must she have been cuffing?
must we have been cuffing?
must you have been cuffing?
must they have been cuffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I cuff?
mustn't you cuff?
mustn't she cuff?
mustn't we cuff?
mustn't you cuff?
mustn't they cuff? 	mustn't I be cuffing?
mustn't you be cuffing?
mustn't she be cuffing?
mustn't we be cuffing?
mustn't you be cuffing?
mustn't they be cuffing? 	mustn't I have cuffed?
mustn't you have cuffed?
mustn't she have cuffed?
mustn't we have cuffed?
mustn't you have cuffed?
mustn't they have cuffed? 	mustn't I have been cuffing?
mustn't you have been cuffing?
mustn't she have been cuffing?
mustn't we have been cuffing?
mustn't you have been cuffing?
mustn't they have been cuffing?