must engross
Regular verb: engross - engrossed- engrossed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must engross
you must engross
she must engross
we must engross
you must engross
they must engross 	I must be engrossing
you must be engrossing
she must be engrossing
we must be engrossing
you must be engrossing
they must be engrossing	I must have engrossed
you must have engrossed
she must have engrossed
we must have engrossed
you must have engrossed
they must have engrossed	I must have been engrossing
you must have been engrossing
she must have been engrossing
we must have been engrossing
you must have been engrossing
they must have been engrossing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not engross
you must not engross
she must not engross
we must not engross
you must not engross
they must not engross 	I must not be engrossing
you must not be engrossing
she must not be engrossing
we must not be engrossing
you must not be engrossing
they must not be engrossing	I must not have engrossed
you must not have engrossed
she must not have engrossed
we must not have engrossed
you must not have engrossed
they must not have engrossed	I must not have been engrossing
you must not have been engrossing
she must not have been engrossing
we must not have been engrossing
you must not have been engrossing
they must not have been engrossing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I engross?
must you engross?
must she engross?
must we engross?
must you engross?
must they engross? 	must I be engrossing?
must you be engrossing?
must she be engrossing?
must we be engrossing?
must you be engrossing?
must they be engrossing? 	must I have engrossed?
must you have engrossed?
must she have engrossed?
must we have engrossed?
must you have engrossed?
must they have engrossed? 	must I have been engrossing?
must you have been engrossing?
must she have been engrossing?
must we have been engrossing?
must you have been engrossing?
must they have been engrossing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not engross?
must you not engross?
must she not engross?
must we not engross?
must you not engross?
must they not engross? 	must I not be engrossing?
must you not be engrossing?
must she not be engrossing?
must we not be engrossing?
must you not be engrossing?
must they not be engrossing? 	must I not have engrossed?
must you not have engrossed?
must she not have engrossed?
must we not have engrossed?
must you not have engrossed?
must they not have engrossed? 	must I not have been engrossing?
must you not have been engrossing?
must she not have been engrossing?
must we not have been engrossing?
must you not have been engrossing?
must they not have been engrossing?