could guffaw
Regular verb: guffaw - guffawed- guffawed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could guffaw
you could guffaw
he could guffaw
we could guffaw
you could guffaw
they could guffaw 	I could be guffawing
you could be guffawing
he could be guffawing
we could be guffawing
you could be guffawing
they could be guffawing	I could have guffawed
you could have guffawed
he could have guffawed
we could have guffawed
you could have guffawed
they could have guffawed	I could have been guffawing
you could have been guffawing
he could have been guffawing
we could have been guffawing
you could have been guffawing
they could have been guffawing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not guffaw
you could not guffaw
he could not guffaw
we could not guffaw
you could not guffaw
they could not guffaw 	I could not be guffawing
you could not be guffawing
he could not be guffawing
we could not be guffawing
you could not be guffawing
they could not be guffawing	I could not have guffawed
you could not have guffawed
he could not have guffawed
we could not have guffawed
you could not have guffawed
they could not have guffawed	I could not have been guffawing
you could not have been guffawing
he could not have been guffawing
we could not have been guffawing
you could not have been guffawing
they could not have been guffawing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I guffaw?
could you guffaw?
could he guffaw?
could we guffaw?
could you guffaw?
could they guffaw? 	could I be guffawing?
could you be guffawing?
could he be guffawing?
could we be guffawing?
could you be guffawing?
could they be guffawing? 	could I have guffawed?
could you have guffawed?
could he have guffawed?
could we have guffawed?
could you have guffawed?
could they have guffawed? 	could I have been guffawing?
could you have been guffawing?
could he have been guffawing?
could we have been guffawing?
could you have been guffawing?
could they have been guffawing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not guffaw?
could you not guffaw?
could he not guffaw?
could we not guffaw?
could you not guffaw?
could they not guffaw? 	could I not be guffawing?
could you not be guffawing?
could he not be guffawing?
could we not be guffawing?
could you not be guffawing?
could they not be guffawing? 	could I not have guffawed?
could you not have guffawed?
could he not have guffawed?
could we not have guffawed?
could you not have guffawed?
could they not have guffawed? 	could I not have been guffawing?
could you not have been guffawing?
could he not have been guffawing?
could we not have been guffawing?
could you not have been guffawing?
could they not have been guffawing?