could unbrace
Regular verb: unbrace - unbraced- unbraced

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could unbrace
you could unbrace
he could unbrace
we could unbrace
you could unbrace
they could unbrace 	I could be unbracing
you could be unbracing
he could be unbracing
we could be unbracing
you could be unbracing
they could be unbracing	I could have unbraced
you could have unbraced
he could have unbraced
we could have unbraced
you could have unbraced
they could have unbraced	I could have been unbracing
you could have been unbracing
he could have been unbracing
we could have been unbracing
you could have been unbracing
they could have been unbracing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't unbrace
you couldn't unbrace
he couldn't unbrace
we couldn't unbrace
you couldn't unbrace
they couldn't unbrace 	I couldn't be unbracing
you couldn't be unbracing
he couldn't be unbracing
we couldn't be unbracing
you couldn't be unbracing
they couldn't be unbracing	I couldn't have unbraced
you couldn't have unbraced
he couldn't have unbraced
we couldn't have unbraced
you couldn't have unbraced
they couldn't have unbraced	I couldn't have been unbracing
you couldn't have been unbracing
he couldn't have been unbracing
we couldn't have been unbracing
you couldn't have been unbracing
they couldn't have been unbracing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I unbrace?
could you unbrace?
could he unbrace?
could we unbrace?
could you unbrace?
could they unbrace? 	could I be unbracing?
could you be unbracing?
could he be unbracing?
could we be unbracing?
could you be unbracing?
could they be unbracing? 	could I have unbraced?
could you have unbraced?
could he have unbraced?
could we have unbraced?
could you have unbraced?
could they have unbraced? 	could I have been unbracing?
could you have been unbracing?
could he have been unbracing?
could we have been unbracing?
could you have been unbracing?
could they have been unbracing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I unbrace?
couldn't you unbrace?
couldn't he unbrace?
couldn't we unbrace?
couldn't you unbrace?
couldn't they unbrace? 	couldn't I be unbracing?
couldn't you be unbracing?
couldn't he be unbracing?
couldn't we be unbracing?
couldn't you be unbracing?
couldn't they be unbracing? 	couldn't I have unbraced?
couldn't you have unbraced?
couldn't he have unbraced?
couldn't we have unbraced?
couldn't you have unbraced?
couldn't they have unbraced? 	couldn't I have been unbracing?
couldn't you have been unbracing?
couldn't he have been unbracing?
couldn't we have been unbracing?
couldn't you have been unbracing?
couldn't they have been unbracing?