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