could burr
Regular verb: burr - burred- burred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could burr
you could burr
he could burr
we could burr
you could burr
they could burr 	I could be burring
you could be burring
he could be burring
we could be burring
you could be burring
they could be burring	I could have burred
you could have burred
he could have burred
we could have burred
you could have burred
they could have burred	I could have been burring
you could have been burring
he could have been burring
we could have been burring
you could have been burring
they could have been burring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't burr
you couldn't burr
he couldn't burr
we couldn't burr
you couldn't burr
they couldn't burr 	I couldn't be burring
you couldn't be burring
he couldn't be burring
we couldn't be burring
you couldn't be burring
they couldn't be burring	I couldn't have burred
you couldn't have burred
he couldn't have burred
we couldn't have burred
you couldn't have burred
they couldn't have burred	I couldn't have been burring
you couldn't have been burring
he couldn't have been burring
we couldn't have been burring
you couldn't have been burring
they couldn't have been burring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I burr?
could you burr?
could he burr?
could we burr?
could you burr?
could they burr? 	could I be burring?
could you be burring?
could he be burring?
could we be burring?
could you be burring?
could they be burring? 	could I have burred?
could you have burred?
could he have burred?
could we have burred?
could you have burred?
could they have burred? 	could I have been burring?
could you have been burring?
could he have been burring?
could we have been burring?
could you have been burring?
could they have been burring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I burr?
couldn't you burr?
couldn't he burr?
couldn't we burr?
couldn't you burr?
couldn't they burr? 	couldn't I be burring?
couldn't you be burring?
couldn't he be burring?
couldn't we be burring?
couldn't you be burring?
couldn't they be burring? 	couldn't I have burred?
couldn't you have burred?
couldn't he have burred?
couldn't we have burred?
couldn't you have burred?
couldn't they have burred? 	couldn't I have been burring?
couldn't you have been burring?
couldn't he have been burring?
couldn't we have been burring?
couldn't you have been burring?
couldn't they have been burring?