could unstick
Regular verb: unstick - unsticked- unsticked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could unstick
you could unstick
she could unstick
we could unstick
you could unstick
they could unstick 	I could be unsticking
you could be unsticking
she could be unsticking
we could be unsticking
you could be unsticking
they could be unsticking	I could have unsticked
you could have unsticked
she could have unsticked
we could have unsticked
you could have unsticked
they could have unsticked	I could have been unsticking
you could have been unsticking
she could have been unsticking
we could have been unsticking
you could have been unsticking
they could have been unsticking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't unstick
you couldn't unstick
she couldn't unstick
we couldn't unstick
you couldn't unstick
they couldn't unstick 	I couldn't be unsticking
you couldn't be unsticking
she couldn't be unsticking
we couldn't be unsticking
you couldn't be unsticking
they couldn't be unsticking	I couldn't have unsticked
you couldn't have unsticked
she couldn't have unsticked
we couldn't have unsticked
you couldn't have unsticked
they couldn't have unsticked	I couldn't have been unsticking
you couldn't have been unsticking
she couldn't have been unsticking
we couldn't have been unsticking
you couldn't have been unsticking
they couldn't have been unsticking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I unstick?
could you unstick?
could she unstick?
could we unstick?
could you unstick?
could they unstick? 	could I be unsticking?
could you be unsticking?
could she be unsticking?
could we be unsticking?
could you be unsticking?
could they be unsticking? 	could I have unsticked?
could you have unsticked?
could she have unsticked?
could we have unsticked?
could you have unsticked?
could they have unsticked? 	could I have been unsticking?
could you have been unsticking?
could she have been unsticking?
could we have been unsticking?
could you have been unsticking?
could they have been unsticking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I unstick?
couldn't you unstick?
couldn't she unstick?
couldn't we unstick?
couldn't you unstick?
couldn't they unstick? 	couldn't I be unsticking?
couldn't you be unsticking?
couldn't she be unsticking?
couldn't we be unsticking?
couldn't you be unsticking?
couldn't they be unsticking? 	couldn't I have unsticked?
couldn't you have unsticked?
couldn't she have unsticked?
couldn't we have unsticked?
couldn't you have unsticked?
couldn't they have unsticked? 	couldn't I have been unsticking?
couldn't you have been unsticking?
couldn't she have been unsticking?
couldn't we have been unsticking?
couldn't you have been unsticking?
couldn't they have been unsticking?