English verb conjugation
MUST ENGROSS

Regular verb: engross - engrossed - engrossed

Affirmation

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