could curl
Verbo regular: curl - curled- curled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could curl
you could curl
he could curl
we could curl
you could curl
they could curl 	I could be curling
you could be curling
he could be curling
we could be curling
you could be curling
they could be curling	I could have curled
you could have curled
he could have curled
we could have curled
you could have curled
they could have curled	I could have been curling
you could have been curling
he could have been curling
we could have been curling
you could have been curling
they could have been curling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't curl
you couldn't curl
he couldn't curl
we couldn't curl
you couldn't curl
they couldn't curl 	I couldn't be curling
you couldn't be curling
he couldn't be curling
we couldn't be curling
you couldn't be curling
they couldn't be curling	I couldn't have curled
you couldn't have curled
he couldn't have curled
we couldn't have curled
you couldn't have curled
they couldn't have curled	I couldn't have been curling
you couldn't have been curling
he couldn't have been curling
we couldn't have been curling
you couldn't have been curling
they couldn't have been curling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I curl?
could you curl?
could he curl?
could we curl?
could you curl?
could they curl? 	could I be curling?
could you be curling?
could he be curling?
could we be curling?
could you be curling?
could they be curling? 	could I have curled?
could you have curled?
could he have curled?
could we have curled?
could you have curled?
could they have curled? 	could I have been curling?
could you have been curling?
could he have been curling?
could we have been curling?
could you have been curling?
could they have been curling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I curl?
couldn't you curl?
couldn't he curl?
couldn't we curl?
couldn't you curl?
couldn't they curl? 	couldn't I be curling?
couldn't you be curling?
couldn't he be curling?
couldn't we be curling?
couldn't you be curling?
couldn't they be curling? 	couldn't I have curled?
couldn't you have curled?
couldn't he have curled?
couldn't we have curled?
couldn't you have curled?
couldn't they have curled? 	couldn't I have been curling?
couldn't you have been curling?
couldn't he have been curling?
couldn't we have been curling?
couldn't you have been curling?
couldn't they have been curling?