could spur
Regular verb: spur - spurred- spurred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could spur
you could spur
he could spur
we could spur
you could spur
they could spur 	I could be spurring
you could be spurring
he could be spurring
we could be spurring
you could be spurring
they could be spurring	I could have spurred
you could have spurred
he could have spurred
we could have spurred
you could have spurred
they could have spurred	I could have been spurring
you could have been spurring
he could have been spurring
we could have been spurring
you could have been spurring
they could have been spurring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't spur
you couldn't spur
he couldn't spur
we couldn't spur
you couldn't spur
they couldn't spur 	I couldn't be spurring
you couldn't be spurring
he couldn't be spurring
we couldn't be spurring
you couldn't be spurring
they couldn't be spurring	I couldn't have spurred
you couldn't have spurred
he couldn't have spurred
we couldn't have spurred
you couldn't have spurred
they couldn't have spurred	I couldn't have been spurring
you couldn't have been spurring
he couldn't have been spurring
we couldn't have been spurring
you couldn't have been spurring
they couldn't have been spurring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I spur?
could you spur?
could he spur?
could we spur?
could you spur?
could they spur? 	could I be spurring?
could you be spurring?
could he be spurring?
could we be spurring?
could you be spurring?
could they be spurring? 	could I have spurred?
could you have spurred?
could he have spurred?
could we have spurred?
could you have spurred?
could they have spurred? 	could I have been spurring?
could you have been spurring?
could he have been spurring?
could we have been spurring?
could you have been spurring?
could they have been spurring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I spur?
couldn't you spur?
couldn't he spur?
couldn't we spur?
couldn't you spur?
couldn't they spur? 	couldn't I be spurring?
couldn't you be spurring?
couldn't he be spurring?
couldn't we be spurring?
couldn't you be spurring?
couldn't they be spurring? 	couldn't I have spurred?
couldn't you have spurred?
couldn't he have spurred?
couldn't we have spurred?
couldn't you have spurred?
couldn't they have spurred? 	couldn't I have been spurring?
couldn't you have been spurring?
couldn't he have been spurring?
couldn't we have been spurring?
couldn't you have been spurring?
couldn't they have been spurring?