could shred
Verbo regular: shred - shredded- shredded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could shred
you could shred
he could shred
we could shred
you could shred
they could shred 	I could be shredding
you could be shredding
he could be shredding
we could be shredding
you could be shredding
they could be shredding	I could have shredded
you could have shredded
he could have shredded
we could have shredded
you could have shredded
they could have shredded	I could have been shredding
you could have been shredding
he could have been shredding
we could have been shredding
you could have been shredding
they could have been shredding	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't shred
you couldn't shred
he couldn't shred
we couldn't shred
you couldn't shred
they couldn't shred 	I couldn't be shredding
you couldn't be shredding
he couldn't be shredding
we couldn't be shredding
you couldn't be shredding
they couldn't be shredding	I couldn't have shredded
you couldn't have shredded
he couldn't have shredded
we couldn't have shredded
you couldn't have shredded
they couldn't have shredded	I couldn't have been shredding
you couldn't have been shredding
he couldn't have been shredding
we couldn't have been shredding
you couldn't have been shredding
they couldn't have been shredding	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I shred?
could you shred?
could he shred?
could we shred?
could you shred?
could they shred? 	could I be shredding?
could you be shredding?
could he be shredding?
could we be shredding?
could you be shredding?
could they be shredding? 	could I have shredded?
could you have shredded?
could he have shredded?
could we have shredded?
could you have shredded?
could they have shredded? 	could I have been shredding?
could you have been shredding?
could he have been shredding?
could we have been shredding?
could you have been shredding?
could they have been shredding? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I shred?
couldn't you shred?
couldn't he shred?
couldn't we shred?
couldn't you shred?
couldn't they shred? 	couldn't I be shredding?
couldn't you be shredding?
couldn't he be shredding?
couldn't we be shredding?
couldn't you be shredding?
couldn't they be shredding? 	couldn't I have shredded?
couldn't you have shredded?
couldn't he have shredded?
couldn't we have shredded?
couldn't you have shredded?
couldn't they have shredded? 	couldn't I have been shredding?
couldn't you have been shredding?
couldn't he have been shredding?
couldn't we have been shredding?
couldn't you have been shredding?
couldn't they have been shredding?