can guffaw
Regular verb: guffaw - guffawed- guffawed

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

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

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

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