could unround
Regular verb: unround - unrounded- unrounded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could unround
you could unround
he could unround
we could unround
you could unround
they could unround 	I could be unrounding
you could be unrounding
he could be unrounding
we could be unrounding
you could be unrounding
they could be unrounding	I could have unrounded
you could have unrounded
he could have unrounded
we could have unrounded
you could have unrounded
they could have unrounded	I could have been unrounding
you could have been unrounding
he could have been unrounding
we could have been unrounding
you could have been unrounding
they could have been unrounding	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't unround
you couldn't unround
he couldn't unround
we couldn't unround
you couldn't unround
they couldn't unround 	I couldn't be unrounding
you couldn't be unrounding
he couldn't be unrounding
we couldn't be unrounding
you couldn't be unrounding
they couldn't be unrounding	I couldn't have unrounded
you couldn't have unrounded
he couldn't have unrounded
we couldn't have unrounded
you couldn't have unrounded
they couldn't have unrounded	I couldn't have been unrounding
you couldn't have been unrounding
he couldn't have been unrounding
we couldn't have been unrounding
you couldn't have been unrounding
they couldn't have been unrounding	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I unround?
could you unround?
could he unround?
could we unround?
could you unround?
could they unround? 	could I be unrounding?
could you be unrounding?
could he be unrounding?
could we be unrounding?
could you be unrounding?
could they be unrounding? 	could I have unrounded?
could you have unrounded?
could he have unrounded?
could we have unrounded?
could you have unrounded?
could they have unrounded? 	could I have been unrounding?
could you have been unrounding?
could he have been unrounding?
could we have been unrounding?
could you have been unrounding?
could they have been unrounding? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I unround?
couldn't you unround?
couldn't he unround?
couldn't we unround?
couldn't you unround?
couldn't they unround? 	couldn't I be unrounding?
couldn't you be unrounding?
couldn't he be unrounding?
couldn't we be unrounding?
couldn't you be unrounding?
couldn't they be unrounding? 	couldn't I have unrounded?
couldn't you have unrounded?
couldn't he have unrounded?
couldn't we have unrounded?
couldn't you have unrounded?
couldn't they have unrounded? 	couldn't I have been unrounding?
couldn't you have been unrounding?
couldn't he have been unrounding?
couldn't we have been unrounding?
couldn't you have been unrounding?
couldn't they have been unrounding?