English verb conjugation
COULD GUFFAW

Regular verb: guffaw - guffawed - guffawed

Affirmation

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

Interrogative form

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