could unbind
Irregular verb: unbind - unbound- unbound

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could unbind
you could unbind
she could unbind
we could unbind
you could unbind
they could unbind 	I could be unbinding
you could be unbinding
she could be unbinding
we could be unbinding
you could be unbinding
they could be unbinding	I could have unbound
you could have unbound
she could have unbound
we could have unbound
you could have unbound
they could have unbound	I could have been unbinding
you could have been unbinding
she could have been unbinding
we could have been unbinding
you could have been unbinding
they could have been unbinding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't unbind
you couldn't unbind
she couldn't unbind
we couldn't unbind
you couldn't unbind
they couldn't unbind 	I couldn't be unbinding
you couldn't be unbinding
she couldn't be unbinding
we couldn't be unbinding
you couldn't be unbinding
they couldn't be unbinding	I couldn't have unbound
you couldn't have unbound
she couldn't have unbound
we couldn't have unbound
you couldn't have unbound
they couldn't have unbound	I couldn't have been unbinding
you couldn't have been unbinding
she couldn't have been unbinding
we couldn't have been unbinding
you couldn't have been unbinding
they couldn't have been unbinding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I unbind?
could you unbind?
could she unbind?
could we unbind?
could you unbind?
could they unbind? 	could I be unbinding?
could you be unbinding?
could she be unbinding?
could we be unbinding?
could you be unbinding?
could they be unbinding? 	could I have unbound?
could you have unbound?
could she have unbound?
could we have unbound?
could you have unbound?
could they have unbound? 	could I have been unbinding?
could you have been unbinding?
could she have been unbinding?
could we have been unbinding?
could you have been unbinding?
could they have been unbinding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I unbind?
couldn't you unbind?
couldn't she unbind?
couldn't we unbind?
couldn't you unbind?
couldn't they unbind? 	couldn't I be unbinding?
couldn't you be unbinding?
couldn't she be unbinding?
couldn't we be unbinding?
couldn't you be unbinding?
couldn't they be unbinding? 	couldn't I have unbound?
couldn't you have unbound?
couldn't she have unbound?
couldn't we have unbound?
couldn't you have unbound?
couldn't they have unbound? 	couldn't I have been unbinding?
couldn't you have been unbinding?
couldn't she have been unbinding?
couldn't we have been unbinding?
couldn't you have been unbinding?
couldn't they have been unbinding?