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
she could slack
we could slack
you could slack
they could slack 	I could be slacking
you could be slacking
she could be slacking
we could be slacking
you could be slacking
they could be slacking	I could have slacked
you could have slacked
she 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
she 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 could not slack
you could not slack
she could not slack
we could not slack
you could not slack
they could not slack 	I could not be slacking
you could not be slacking
she could not be slacking
we could not be slacking
you could not be slacking
they could not be slacking	I could not have slacked
you could not have slacked
she could not have slacked
we could not have slacked
you could not have slacked
they could not have slacked	I could not have been slacking
you could not have been slacking
she could not have been slacking
we could not have been slacking
you could not have been slacking
they could not have been slacking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I slack?
could you slack?
could she slack?
could we slack?
could you slack?
could they slack? 	could I be slacking?
could you be slacking?
could she be slacking?
could we be slacking?
could you be slacking?
could they be slacking? 	could I have slacked?
could you have slacked?
could she 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 she 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 	
could I not slack?
could you not slack?
could she not slack?
could we not slack?
could you not slack?
could they not slack? 	could I not be slacking?
could you not be slacking?
could she not be slacking?
could we not be slacking?
could you not be slacking?
could they not be slacking? 	could I not have slacked?
could you not have slacked?
could she not have slacked?
could we not have slacked?
could you not have slacked?
could they not have slacked? 	could I not have been slacking?
could you not have been slacking?
could she not have been slacking?
could we not have been slacking?
could you not have been slacking?
could they not have been slacking?