could unravel
Regular verb: unravel - unravelled- unravelled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could unravel
you could unravel
he could unravel
we could unravel
you could unravel
they could unravel 	I could be unravelling
you could be unravelling
he could be unravelling
we could be unravelling
you could be unravelling
they could be unravelling	I could have unravelled
you could have unravelled
he could have unravelled
we could have unravelled
you could have unravelled
they could have unravelled	I could have been unravelling
you could have been unravelling
he could have been unravelling
we could have been unravelling
you could have been unravelling
they could have been unravelling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't unravel
you couldn't unravel
he couldn't unravel
we couldn't unravel
you couldn't unravel
they couldn't unravel 	I couldn't be unravelling
you couldn't be unravelling
he couldn't be unravelling
we couldn't be unravelling
you couldn't be unravelling
they couldn't be unravelling	I couldn't have unravelled
you couldn't have unravelled
he couldn't have unravelled
we couldn't have unravelled
you couldn't have unravelled
they couldn't have unravelled	I couldn't have been unravelling
you couldn't have been unravelling
he couldn't have been unravelling
we couldn't have been unravelling
you couldn't have been unravelling
they couldn't have been unravelling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I unravel?
could you unravel?
could he unravel?
could we unravel?
could you unravel?
could they unravel? 	could I be unravelling?
could you be unravelling?
could he be unravelling?
could we be unravelling?
could you be unravelling?
could they be unravelling? 	could I have unravelled?
could you have unravelled?
could he have unravelled?
could we have unravelled?
could you have unravelled?
could they have unravelled? 	could I have been unravelling?
could you have been unravelling?
could he have been unravelling?
could we have been unravelling?
could you have been unravelling?
could they have been unravelling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I unravel?
couldn't you unravel?
couldn't he unravel?
couldn't we unravel?
couldn't you unravel?
couldn't they unravel? 	couldn't I be unravelling?
couldn't you be unravelling?
couldn't he be unravelling?
couldn't we be unravelling?
couldn't you be unravelling?
couldn't they be unravelling? 	couldn't I have unravelled?
couldn't you have unravelled?
couldn't he have unravelled?
couldn't we have unravelled?
couldn't you have unravelled?
couldn't they have unravelled? 	couldn't I have been unravelling?
couldn't you have been unravelling?
couldn't he have been unravelling?
couldn't we have been unravelling?
couldn't you have been unravelling?
couldn't they have been unravelling?