English verb conjugation
MUST ENGULF

Regular verb: engulf - engulfed - engulfed

Affirmation

Simple form	V-ing form
I must engulf you must engulf he must engulf we must engulf you must engulf they must engulf	I must be engulfing you must be engulfing he must be engulfing we must be engulfing you must be engulfing they must be engulfing
Perfect	V-ing perfect
I must have engulfed you must have engulfed he must have engulfed we must have engulfed you must have engulfed they must have engulfed	I must have been engulfing you must have been engulfing he must have been engulfing we must have been engulfing you must have been engulfing they must have been engulfing

Negation

Simple form	V-ing form
I mustn't engulf you mustn't engulf he mustn't engulf we mustn't engulf you mustn't engulf they mustn't engulf	I mustn't be engulfing you mustn't be engulfing he mustn't be engulfing we mustn't be engulfing you mustn't be engulfing they mustn't be engulfing
Perfect	V-ing perfect
I mustn't have engulfed you mustn't have engulfed he mustn't have engulfed we mustn't have engulfed you mustn't have engulfed they mustn't have engulfed	I mustn't have been engulfing you mustn't have been engulfing he mustn't have been engulfing we mustn't have been engulfing you mustn't have been engulfing they mustn't have been engulfing

Interrogative form

Simple form	V-ing form
must I engulf? must you engulf? must he engulf? must we engulf? must you engulf? must they engulf?	must I be engulfing? must you be engulfing? must he be engulfing? must we be engulfing? must you be engulfing? must they be engulfing?
Perfect	V-ing perfect
must I have engulfed? must you have engulfed? must he have engulfed? must we have engulfed? must you have engulfed? must they have engulfed?	must I have been engulfing? must you have been engulfing? must he have been engulfing? must we have been engulfing? must you have been engulfing? must they have been engulfing?

Interro-negative form

Simple form	V-ing form
mustn't I engulf? mustn't you engulf? mustn't he engulf? mustn't we engulf? mustn't you engulf? mustn't they engulf?	mustn't I be engulfing? mustn't you be engulfing? mustn't he be engulfing? mustn't we be engulfing? mustn't you be engulfing? mustn't they be engulfing?
Perfect	V-ing perfect
mustn't I have engulfed? mustn't you have engulfed? mustn't he have engulfed? mustn't we have engulfed? mustn't you have engulfed? mustn't they have engulfed?	mustn't I have been engulfing? mustn't you have been engulfing? mustn't he have been engulfing? mustn't we have been engulfing? mustn't you have been engulfing? mustn't they have been engulfing?