English verb conjugation
CAN GUFFAW

Regular verb: guffaw - guffawed - guffawed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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
I can't guffaw you can't guffaw he can't guffaw we can't guffaw you can't guffaw they can't guffaw	I can't be guffawing you can't be guffawing he can't be guffawing we can't be guffawing you can't be guffawing they can't be guffawing
Perfect	V-ing perfect
I can't have guffawed you can't have guffawed he can't have guffawed we can't have guffawed you can't have guffawed they can't have guffawed	I can't have been guffawing you can't have been guffawing he can't have been guffawing we can't have been guffawing you can't have been guffawing they can't have been guffawing

Interrogative form

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