English verb conjugation
MUST GUFFAW

Regular verb: guffaw - guffawed - guffawed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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