could curl
Regular verb: curl - curled- curled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not curl
you could not curl
he could not curl
we could not curl
you could not curl
they could not curl 	I could not be curling
you could not be curling
he could not be curling
we could not be curling
you could not be curling
they could not be curling	I could not have curled
you could not have curled
he could not have curled
we could not have curled
you could not have curled
they could not have curled	I could not have been curling
you could not have been curling
he could not have been curling
we could not have been curling
you could not have been curling
they could not have been curling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not curl?
could you not curl?
could he not curl?
could we not curl?
could you not curl?
could they not curl? 	could I not be curling?
could you not be curling?
could he not be curling?
could we not be curling?
could you not be curling?
could they not be curling? 	could I not have curled?
could you not have curled?
could he not have curled?
could we not have curled?
could you not have curled?
could they not have curled? 	could I not have been curling?
could you not have been curling?
could he not have been curling?
could we not have been curling?
could you not have been curling?
could they not have been curling?