must shred
Verbo regular: shred - shredded- shredded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must shred
you must shred
he must shred
we must shred
you must shred
they must shred 	I must be shredding
you must be shredding
he must be shredding
we must be shredding
you must be shredding
they must be shredding	I must have shredded
you must have shredded
he 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
he must have been shredding
we must have been shredding
you must have been shredding
they must have been shredding	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I mustn't shred
you mustn't shred
he 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
he 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
he 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
he mustn't have been shredding
we mustn't have been shredding
you mustn't have been shredding
they mustn't have been shredding	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I shred?
must you shred?
must he shred?
must we shred?
must you shred?
must they shred? 	must I be shredding?
must you be shredding?
must he be shredding?
must we be shredding?
must you be shredding?
must they be shredding? 	must I have shredded?
must you have shredded?
must he 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 he have been shredding?
must we have been shredding?
must you have been shredding?
must they have been shredding? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
mustn't I shred?
mustn't you shred?
mustn't he 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 he 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 he 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 he have been shredding?
mustn't we have been shredding?
mustn't you have been shredding?
mustn't they have been shredding?