English verb conjugation
MUST GULF

Regular verb: gulf - gulfed - gulfed

Affirmation

Simple form	V-ing form
I must gulf you must gulf he must gulf we must gulf you must gulf they must gulf	I must be gulfing you must be gulfing he must be gulfing we must be gulfing you must be gulfing they must be gulfing
Perfect	V-ing perfect
I must have gulfed you must have gulfed he must have gulfed we must have gulfed you must have gulfed they must have gulfed	I must have been gulfing you must have been gulfing he must have been gulfing we must have been gulfing you must have been gulfing they must have been gulfing

Negation

Simple form	V-ing form
I must not gulf you must not gulf he must not gulf we must not gulf you must not gulf they must not gulf	I must not be gulfing you must not be gulfing he must not be gulfing we must not be gulfing you must not be gulfing they must not be gulfing
Perfect	V-ing perfect
I must not have gulfed you must not have gulfed he must not have gulfed we must not have gulfed you must not have gulfed they must not have gulfed	I must not have been gulfing you must not have been gulfing he must not have been gulfing we must not have been gulfing you must not have been gulfing they must not have been gulfing

Interrogative form

Simple form	V-ing form
must I gulf? must you gulf? must he gulf? must we gulf? must you gulf? must they gulf?	must I be gulfing? must you be gulfing? must he be gulfing? must we be gulfing? must you be gulfing? must they be gulfing?
Perfect	V-ing perfect
must I have gulfed? must you have gulfed? must he have gulfed? must we have gulfed? must you have gulfed? must they have gulfed?	must I have been gulfing? must you have been gulfing? must he have been gulfing? must we have been gulfing? must you have been gulfing? must they have been gulfing?

Interro-negative form

Simple form	V-ing form
must I not gulf? must you not gulf? must he not gulf? must we not gulf? must you not gulf? must they not gulf?	must I not be gulfing? must you not be gulfing? must he not be gulfing? must we not be gulfing? must you not be gulfing? must they not be gulfing?
Perfect	V-ing perfect
must I not have gulfed? must you not have gulfed? must he not have gulfed? must we not have gulfed? must you not have gulfed? must they not have gulfed?	must I not have been gulfing? must you not have been gulfing? must he not have been gulfing? must we not have been gulfing? must you not have been gulfing? must they not have been gulfing?