could unroll
Regular verb: unroll - unrolled- unrolled

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could unroll
you could unroll
he could unroll
we could unroll
you could unroll
they could unroll 	I could be unrolling
you could be unrolling
he could be unrolling
we could be unrolling
you could be unrolling
they could be unrolling	I could have unrolled
you could have unrolled
he could have unrolled
we could have unrolled
you could have unrolled
they could have unrolled	I could have been unrolling
you could have been unrolling
he could have been unrolling
we could have been unrolling
you could have been unrolling
they could have been unrolling	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't unroll
you couldn't unroll
he couldn't unroll
we couldn't unroll
you couldn't unroll
they couldn't unroll 	I couldn't be unrolling
you couldn't be unrolling
he couldn't be unrolling
we couldn't be unrolling
you couldn't be unrolling
they couldn't be unrolling	I couldn't have unrolled
you couldn't have unrolled
he couldn't have unrolled
we couldn't have unrolled
you couldn't have unrolled
they couldn't have unrolled	I couldn't have been unrolling
you couldn't have been unrolling
he couldn't have been unrolling
we couldn't have been unrolling
you couldn't have been unrolling
they couldn't have been unrolling	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I unroll?
could you unroll?
could he unroll?
could we unroll?
could you unroll?
could they unroll? 	could I be unrolling?
could you be unrolling?
could he be unrolling?
could we be unrolling?
could you be unrolling?
could they be unrolling? 	could I have unrolled?
could you have unrolled?
could he have unrolled?
could we have unrolled?
could you have unrolled?
could they have unrolled? 	could I have been unrolling?
could you have been unrolling?
could he have been unrolling?
could we have been unrolling?
could you have been unrolling?
could they have been unrolling? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I unroll?
couldn't you unroll?
couldn't he unroll?
couldn't we unroll?
couldn't you unroll?
couldn't they unroll? 	couldn't I be unrolling?
couldn't you be unrolling?
couldn't he be unrolling?
couldn't we be unrolling?
couldn't you be unrolling?
couldn't they be unrolling? 	couldn't I have unrolled?
couldn't you have unrolled?
couldn't he have unrolled?
couldn't we have unrolled?
couldn't you have unrolled?
couldn't they have unrolled? 	couldn't I have been unrolling?
couldn't you have been unrolling?
couldn't he have been unrolling?
couldn't we have been unrolling?
couldn't you have been unrolling?
couldn't they have been unrolling?