could blur
Regular verb: blur - blurred- blurred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could blur
you could blur
she could blur
we could blur
you could blur
they could blur 	I could be blurring
you could be blurring
she could be blurring
we could be blurring
you could be blurring
they could be blurring	I could have blurred
you could have blurred
she could have blurred
we could have blurred
you could have blurred
they could have blurred	I could have been blurring
you could have been blurring
she could have been blurring
we could have been blurring
you could have been blurring
they could have been blurring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not blur
you could not blur
she could not blur
we could not blur
you could not blur
they could not blur 	I could not be blurring
you could not be blurring
she could not be blurring
we could not be blurring
you could not be blurring
they could not be blurring	I could not have blurred
you could not have blurred
she could not have blurred
we could not have blurred
you could not have blurred
they could not have blurred	I could not have been blurring
you could not have been blurring
she could not have been blurring
we could not have been blurring
you could not have been blurring
they could not have been blurring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I blur?
could you blur?
could she blur?
could we blur?
could you blur?
could they blur? 	could I be blurring?
could you be blurring?
could she be blurring?
could we be blurring?
could you be blurring?
could they be blurring? 	could I have blurred?
could you have blurred?
could she have blurred?
could we have blurred?
could you have blurred?
could they have blurred? 	could I have been blurring?
could you have been blurring?
could she have been blurring?
could we have been blurring?
could you have been blurring?
could they have been blurring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not blur?
could you not blur?
could she not blur?
could we not blur?
could you not blur?
could they not blur? 	could I not be blurring?
could you not be blurring?
could she not be blurring?
could we not be blurring?
could you not be blurring?
could they not be blurring? 	could I not have blurred?
could you not have blurred?
could she not have blurred?
could we not have blurred?
could you not have blurred?
could they not have blurred? 	could I not have been blurring?
could you not have been blurring?
could she not have been blurring?
could we not have been blurring?
could you not have been blurring?
could they not have been blurring?