must shred
Regular verb: shred - shredded- shredded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must shred
you must shred
she must shred
we must shred
you must shred
they must shred 	I must be shredding
you must be shredding
she must be shredding
we must be shredding
you must be shredding
they must be shredding	I must have shredded
you must have shredded
she must have shredded
we must have shredded
you must have shredded
they must have shredded	I must have been shredding
you must have been shredding
she must have been shredding
we must have been shredding
you must have been shredding
they must have been shredding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't shred
you mustn't shred
she mustn't shred
we mustn't shred
you mustn't shred
they mustn't shred 	I mustn't be shredding
you mustn't be shredding
she mustn't be shredding
we mustn't be shredding
you mustn't be shredding
they mustn't be shredding	I mustn't have shredded
you mustn't have shredded
she mustn't have shredded
we mustn't have shredded
you mustn't have shredded
they mustn't have shredded	I mustn't have been shredding
you mustn't have been shredding
she mustn't have been shredding
we mustn't have been shredding
you mustn't have been shredding
they mustn't have been shredding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I shred?
must you shred?
must she shred?
must we shred?
must you shred?
must they shred? 	must I be shredding?
must you be shredding?
must she be shredding?
must we be shredding?
must you be shredding?
must they be shredding? 	must I have shredded?
must you have shredded?
must she have shredded?
must we have shredded?
must you have shredded?
must they have shredded? 	must I have been shredding?
must you have been shredding?
must she have been shredding?
must we have been shredding?
must you have been shredding?
must they have been shredding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I shred?
mustn't you shred?
mustn't she shred?
mustn't we shred?
mustn't you shred?
mustn't they shred? 	mustn't I be shredding?
mustn't you be shredding?
mustn't she be shredding?
mustn't we be shredding?
mustn't you be shredding?
mustn't they be shredding? 	mustn't I have shredded?
mustn't you have shredded?
mustn't she have shredded?
mustn't we have shredded?
mustn't you have shredded?
mustn't they have shredded? 	mustn't I have been shredding?
mustn't you have been shredding?
mustn't she have been shredding?
mustn't we have been shredding?
mustn't you have been shredding?
mustn't they have been shredding?