could hack
Verbo regular: hack - hacked- hacked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could hack
you could hack
he could hack
we could hack
you could hack
they could hack 	I could be hacking
you could be hacking
he could be hacking
we could be hacking
you could be hacking
they could be hacking	I could have hacked
you could have hacked
he could have hacked
we could have hacked
you could have hacked
they could have hacked	I could have been hacking
you could have been hacking
he could have been hacking
we could have been hacking
you could have been hacking
they could have been hacking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't hack
you couldn't hack
he couldn't hack
we couldn't hack
you couldn't hack
they couldn't hack 	I couldn't be hacking
you couldn't be hacking
he couldn't be hacking
we couldn't be hacking
you couldn't be hacking
they couldn't be hacking	I couldn't have hacked
you couldn't have hacked
he couldn't have hacked
we couldn't have hacked
you couldn't have hacked
they couldn't have hacked	I couldn't have been hacking
you couldn't have been hacking
he couldn't have been hacking
we couldn't have been hacking
you couldn't have been hacking
they couldn't have been hacking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I hack?
could you hack?
could he hack?
could we hack?
could you hack?
could they hack? 	could I be hacking?
could you be hacking?
could he be hacking?
could we be hacking?
could you be hacking?
could they be hacking? 	could I have hacked?
could you have hacked?
could he have hacked?
could we have hacked?
could you have hacked?
could they have hacked? 	could I have been hacking?
could you have been hacking?
could he have been hacking?
could we have been hacking?
could you have been hacking?
could they have been hacking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I hack?
couldn't you hack?
couldn't he hack?
couldn't we hack?
couldn't you hack?
couldn't they hack? 	couldn't I be hacking?
couldn't you be hacking?
couldn't he be hacking?
couldn't we be hacking?
couldn't you be hacking?
couldn't they be hacking? 	couldn't I have hacked?
couldn't you have hacked?
couldn't he have hacked?
couldn't we have hacked?
couldn't you have hacked?
couldn't they have hacked? 	couldn't I have been hacking?
couldn't you have been hacking?
couldn't he have been hacking?
couldn't we have been hacking?
couldn't you have been hacking?
couldn't they have been hacking?