I could unwind you could unwind he could unwind we could unwind you could unwind they could unwind
V-ing form
I could be unwinding you could be unwinding he could be unwinding we could be unwinding you could be unwinding they could be unwinding
Perfect
I could have unwound you could have unwound he could have unwound we could have unwound you could have unwound they could have unwound
V-ing perfect
I could have been unwinding you could have been unwinding he could have been unwinding we could have been unwinding you could have been unwinding they could have been unwinding
Negation
Simple form
I couldn't unwind you couldn't unwind he couldn't unwind we couldn't unwind you couldn't unwind they couldn't unwind
V-ing form
I couldn't be unwinding you couldn't be unwinding he couldn't be unwinding we couldn't be unwinding you couldn't be unwinding they couldn't be unwinding
Perfect
I couldn't have unwound you couldn't have unwound he couldn't have unwound we couldn't have unwound you couldn't have unwound they couldn't have unwound
V-ing perfect
I couldn't have been unwinding you couldn't have been unwinding he couldn't have been unwinding we couldn't have been unwinding you couldn't have been unwinding they couldn't have been unwinding
Interrogative form
Simple form
could I unwind? could you unwind? could he unwind? could we unwind? could you unwind? could they unwind?
V-ing form
could I be unwinding? could you be unwinding? could he be unwinding? could we be unwinding? could you be unwinding? could they be unwinding?
Perfect
could I have unwound? could you have unwound? could he have unwound? could we have unwound? could you have unwound? could they have unwound?
V-ing perfect
could I have been unwinding? could you have been unwinding? could he have been unwinding? could we have been unwinding? could you have been unwinding? could they have been unwinding?
Interro-negative form
Simple form
couldn't I unwind? couldn't you unwind? couldn't he unwind? couldn't we unwind? couldn't you unwind? couldn't they unwind?
V-ing form
couldn't I be unwinding? couldn't you be unwinding? couldn't he be unwinding? couldn't we be unwinding? couldn't you be unwinding? couldn't they be unwinding?
Perfect
couldn't I have unwound? couldn't you have unwound? couldn't he have unwound? couldn't we have unwound? couldn't you have unwound? couldn't they have unwound?
V-ing perfect
couldn't I have been unwinding? couldn't you have been unwinding? couldn't he have been unwinding? couldn't we have been unwinding? couldn't you have been unwinding? couldn't they have been unwinding?