could fur
Regular verb: fur - furred- furred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could fur
you could fur
he could fur
we could fur
you could fur
they could fur 	I could be furring
you could be furring
he could be furring
we could be furring
you could be furring
they could be furring	I could have furred
you could have furred
he could have furred
we could have furred
you could have furred
they could have furred	I could have been furring
you could have been furring
he could have been furring
we could have been furring
you could have been furring
they could have been furring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't fur
you couldn't fur
he couldn't fur
we couldn't fur
you couldn't fur
they couldn't fur 	I couldn't be furring
you couldn't be furring
he couldn't be furring
we couldn't be furring
you couldn't be furring
they couldn't be furring	I couldn't have furred
you couldn't have furred
he couldn't have furred
we couldn't have furred
you couldn't have furred
they couldn't have furred	I couldn't have been furring
you couldn't have been furring
he couldn't have been furring
we couldn't have been furring
you couldn't have been furring
they couldn't have been furring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I fur?
could you fur?
could he fur?
could we fur?
could you fur?
could they fur? 	could I be furring?
could you be furring?
could he be furring?
could we be furring?
could you be furring?
could they be furring? 	could I have furred?
could you have furred?
could he have furred?
could we have furred?
could you have furred?
could they have furred? 	could I have been furring?
could you have been furring?
could he have been furring?
could we have been furring?
could you have been furring?
could they have been furring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I fur?
couldn't you fur?
couldn't he fur?
couldn't we fur?
couldn't you fur?
couldn't they fur? 	couldn't I be furring?
couldn't you be furring?
couldn't he be furring?
couldn't we be furring?
couldn't you be furring?
couldn't they be furring? 	couldn't I have furred?
couldn't you have furred?
couldn't he have furred?
couldn't we have furred?
couldn't you have furred?
couldn't they have furred? 	couldn't I have been furring?
couldn't you have been furring?
couldn't he have been furring?
couldn't we have been furring?
couldn't you have been furring?
couldn't they have been furring?