could buffalo
Regular verb: buffalo - buffaloed- buffaloed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could buffalo
you could buffalo
he could buffalo
we could buffalo
you could buffalo
they could buffalo 	I could be buffaloing
you could be buffaloing
he could be buffaloing
we could be buffaloing
you could be buffaloing
they could be buffaloing	I could have buffaloed
you could have buffaloed
he could have buffaloed
we could have buffaloed
you could have buffaloed
they could have buffaloed	I could have been buffaloing
you could have been buffaloing
he could have been buffaloing
we could have been buffaloing
you could have been buffaloing
they could have been buffaloing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not buffalo
you could not buffalo
he could not buffalo
we could not buffalo
you could not buffalo
they could not buffalo 	I could not be buffaloing
you could not be buffaloing
he could not be buffaloing
we could not be buffaloing
you could not be buffaloing
they could not be buffaloing	I could not have buffaloed
you could not have buffaloed
he could not have buffaloed
we could not have buffaloed
you could not have buffaloed
they could not have buffaloed	I could not have been buffaloing
you could not have been buffaloing
he could not have been buffaloing
we could not have been buffaloing
you could not have been buffaloing
they could not have been buffaloing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I buffalo?
could you buffalo?
could he buffalo?
could we buffalo?
could you buffalo?
could they buffalo? 	could I be buffaloing?
could you be buffaloing?
could he be buffaloing?
could we be buffaloing?
could you be buffaloing?
could they be buffaloing? 	could I have buffaloed?
could you have buffaloed?
could he have buffaloed?
could we have buffaloed?
could you have buffaloed?
could they have buffaloed? 	could I have been buffaloing?
could you have been buffaloing?
could he have been buffaloing?
could we have been buffaloing?
could you have been buffaloing?
could they have been buffaloing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not buffalo?
could you not buffalo?
could he not buffalo?
could we not buffalo?
could you not buffalo?
could they not buffalo? 	could I not be buffaloing?
could you not be buffaloing?
could he not be buffaloing?
could we not be buffaloing?
could you not be buffaloing?
could they not be buffaloing? 	could I not have buffaloed?
could you not have buffaloed?
could he not have buffaloed?
could we not have buffaloed?
could you not have buffaloed?
could they not have buffaloed? 	could I not have been buffaloing?
could you not have been buffaloing?
could he not have been buffaloing?
could we not have been buffaloing?
could you not have been buffaloing?
could they not have been buffaloing?