could knacker
Verbo regular: knacker - knackered- knackered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could knacker
you could knacker
he could knacker
we could knacker
you could knacker
they could knacker 	I could be knackering
you could be knackering
he could be knackering
we could be knackering
you could be knackering
they could be knackering	I could have knackered
you could have knackered
he could have knackered
we could have knackered
you could have knackered
they could have knackered	I could have been knackering
you could have been knackering
he could have been knackering
we could have been knackering
you could have been knackering
they could have been knackering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't knacker
you couldn't knacker
he couldn't knacker
we couldn't knacker
you couldn't knacker
they couldn't knacker 	I couldn't be knackering
you couldn't be knackering
he couldn't be knackering
we couldn't be knackering
you couldn't be knackering
they couldn't be knackering	I couldn't have knackered
you couldn't have knackered
he couldn't have knackered
we couldn't have knackered
you couldn't have knackered
they couldn't have knackered	I couldn't have been knackering
you couldn't have been knackering
he couldn't have been knackering
we couldn't have been knackering
you couldn't have been knackering
they couldn't have been knackering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I knacker?
could you knacker?
could he knacker?
could we knacker?
could you knacker?
could they knacker? 	could I be knackering?
could you be knackering?
could he be knackering?
could we be knackering?
could you be knackering?
could they be knackering? 	could I have knackered?
could you have knackered?
could he have knackered?
could we have knackered?
could you have knackered?
could they have knackered? 	could I have been knackering?
could you have been knackering?
could he have been knackering?
could we have been knackering?
could you have been knackering?
could they have been knackering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I knacker?
couldn't you knacker?
couldn't he knacker?
couldn't we knacker?
couldn't you knacker?
couldn't they knacker? 	couldn't I be knackering?
couldn't you be knackering?
couldn't he be knackering?
couldn't we be knackering?
couldn't you be knackering?
couldn't they be knackering? 	couldn't I have knackered?
couldn't you have knackered?
couldn't he have knackered?
couldn't we have knackered?
couldn't you have knackered?
couldn't they have knackered? 	couldn't I have been knackering?
couldn't you have been knackering?
couldn't he have been knackering?
couldn't we have been knackering?
couldn't you have been knackering?
couldn't they have been knackering?