could attribute
Regular verb: attribute - attributed- attributed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could attribute
you could attribute
he could attribute
we could attribute
you could attribute
they could attribute 	I could be attributing
you could be attributing
he could be attributing
we could be attributing
you could be attributing
they could be attributing	I could have attributed
you could have attributed
he could have attributed
we could have attributed
you could have attributed
they could have attributed	I could have been attributing
you could have been attributing
he could have been attributing
we could have been attributing
you could have been attributing
they could have been attributing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not attribute
you could not attribute
he could not attribute
we could not attribute
you could not attribute
they could not attribute 	I could not be attributing
you could not be attributing
he could not be attributing
we could not be attributing
you could not be attributing
they could not be attributing	I could not have attributed
you could not have attributed
he could not have attributed
we could not have attributed
you could not have attributed
they could not have attributed	I could not have been attributing
you could not have been attributing
he could not have been attributing
we could not have been attributing
you could not have been attributing
they could not have been attributing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I attribute?
could you attribute?
could he attribute?
could we attribute?
could you attribute?
could they attribute? 	could I be attributing?
could you be attributing?
could he be attributing?
could we be attributing?
could you be attributing?
could they be attributing? 	could I have attributed?
could you have attributed?
could he have attributed?
could we have attributed?
could you have attributed?
could they have attributed? 	could I have been attributing?
could you have been attributing?
could he have been attributing?
could we have been attributing?
could you have been attributing?
could they have been attributing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not attribute?
could you not attribute?
could he not attribute?
could we not attribute?
could you not attribute?
could they not attribute? 	could I not be attributing?
could you not be attributing?
could he not be attributing?
could we not be attributing?
could you not be attributing?
could they not be attributing? 	could I not have attributed?
could you not have attributed?
could he not have attributed?
could we not have attributed?
could you not have attributed?
could they not have attributed? 	could I not have been attributing?
could you not have been attributing?
could he not have been attributing?
could we not have been attributing?
could you not have been attributing?
could they not have been attributing?