must engulf
Regular verb: engulf - engulfed- engulfed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?