English verb conjugation
MUST GULF

Regular verb: gulf - gulfed - gulfed

Affirmation

Simple form	V-ing form
I must gulf you must gulf she must gulf we must gulf you must gulf they must gulf	I must be gulfing you must be gulfing she 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 she 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 she 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 mustn't gulf you mustn't gulf she mustn't gulf we mustn't gulf you mustn't gulf they mustn't gulf	I mustn't be gulfing you mustn't be gulfing she mustn't be gulfing we mustn't be gulfing you mustn't be gulfing they mustn't be gulfing
Perfect	V-ing perfect
I mustn't have gulfed you mustn't have gulfed she mustn't have gulfed we mustn't have gulfed you mustn't have gulfed they mustn't have gulfed	I mustn't have been gulfing you mustn't have been gulfing she mustn't have been gulfing we mustn't have been gulfing you mustn't have been gulfing they mustn't have been gulfing

Interrogative form

Simple form	V-ing form
must I gulf? must you gulf? must she gulf? must we gulf? must you gulf? must they gulf?	must I be gulfing? must you be gulfing? must she 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 she 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 she 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
mustn't I gulf? mustn't you gulf? mustn't she gulf? mustn't we gulf? mustn't you gulf? mustn't they gulf?	mustn't I be gulfing? mustn't you be gulfing? mustn't she be gulfing? mustn't we be gulfing? mustn't you be gulfing? mustn't they be gulfing?
Perfect	V-ing perfect
mustn't I have gulfed? mustn't you have gulfed? mustn't she have gulfed? mustn't we have gulfed? mustn't you have gulfed? mustn't they have gulfed?	mustn't I have been gulfing? mustn't you have been gulfing? mustn't she have been gulfing? mustn't we have been gulfing? mustn't you have been gulfing? mustn't they have been gulfing?