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 couldn't blur
you couldn't blur
she couldn't blur
we couldn't blur
you couldn't blur
they couldn't blur 	I couldn't be blurring
you couldn't be blurring
she couldn't be blurring
we couldn't be blurring
you couldn't be blurring
they couldn't be blurring	I couldn't have blurred
you couldn't have blurred
she couldn't have blurred
we couldn't have blurred
you couldn't have blurred
they couldn't have blurred	I couldn't have been blurring
you couldn't have been blurring
she couldn't have been blurring
we couldn't have been blurring
you couldn't have been blurring
they couldn't 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 	
couldn't I blur?
couldn't you blur?
couldn't she blur?
couldn't we blur?
couldn't you blur?
couldn't they blur? 	couldn't I be blurring?
couldn't you be blurring?
couldn't she be blurring?
couldn't we be blurring?
couldn't you be blurring?
couldn't they be blurring? 	couldn't I have blurred?
couldn't you have blurred?
couldn't she have blurred?
couldn't we have blurred?
couldn't you have blurred?
couldn't they have blurred? 	couldn't I have been blurring?
couldn't you have been blurring?
couldn't she have been blurring?
couldn't we have been blurring?
couldn't you have been blurring?
couldn't they have been blurring?