English verb conjugation
MUST ENGULF

Regular verb: engulf - engulfed - engulfed

Affirmation

Simple form	V-ing form
I must engulf you must engulf she must engulf we must engulf you must engulf they must engulf	I must be engulfing you must be engulfing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she engulf? must we engulf? must you engulf? must they engulf?	must I be engulfing? must you be engulfing? must she 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 she 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 she 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 she 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 she 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 she 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 she have been engulfing? mustn't we have been engulfing? mustn't you have been engulfing? mustn't they have been engulfing?