could slack
Verbo regular: slack - slacked- slacked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could slack
you could slack
he could slack
we could slack
you could slack
they could slack 	I could be slacking
you could be slacking
he could be slacking
we could be slacking
you could be slacking
they could be slacking	I could have slacked
you could have slacked
he could have slacked
we could have slacked
you could have slacked
they could have slacked	I could have been slacking
you could have been slacking
he could have been slacking
we could have been slacking
you could have been slacking
they could have been slacking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't slack
you couldn't slack
he couldn't slack
we couldn't slack
you couldn't slack
they couldn't slack 	I couldn't be slacking
you couldn't be slacking
he couldn't be slacking
we couldn't be slacking
you couldn't be slacking
they couldn't be slacking	I couldn't have slacked
you couldn't have slacked
he couldn't have slacked
we couldn't have slacked
you couldn't have slacked
they couldn't have slacked	I couldn't have been slacking
you couldn't have been slacking
he couldn't have been slacking
we couldn't have been slacking
you couldn't have been slacking
they couldn't have been slacking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I slack?
could you slack?
could he slack?
could we slack?
could you slack?
could they slack? 	could I be slacking?
could you be slacking?
could he be slacking?
could we be slacking?
could you be slacking?
could they be slacking? 	could I have slacked?
could you have slacked?
could he have slacked?
could we have slacked?
could you have slacked?
could they have slacked? 	could I have been slacking?
could you have been slacking?
could he have been slacking?
could we have been slacking?
could you have been slacking?
could they have been slacking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I slack?
couldn't you slack?
couldn't he slack?
couldn't we slack?
couldn't you slack?
couldn't they slack? 	couldn't I be slacking?
couldn't you be slacking?
couldn't he be slacking?
couldn't we be slacking?
couldn't you be slacking?
couldn't they be slacking? 	couldn't I have slacked?
couldn't you have slacked?
couldn't he have slacked?
couldn't we have slacked?
couldn't you have slacked?
couldn't they have slacked? 	couldn't I have been slacking?
couldn't you have been slacking?
couldn't he have been slacking?
couldn't we have been slacking?
couldn't you have been slacking?
couldn't they have been slacking?