English verb conjugation
MUST ENGROSS

Regular verb: engross - engrossed - engrossed

Affirmation

Simple form	V-ing form
I must engross you must engross he must engross we must engross you must engross they must engross	I must be engrossing you must be engrossing he 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 he 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 he 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 mustn't engross you mustn't engross he mustn't engross we mustn't engross you mustn't engross they mustn't engross	I mustn't be engrossing you mustn't be engrossing he mustn't be engrossing we mustn't be engrossing you mustn't be engrossing they mustn't be engrossing
Perfect	V-ing perfect
I mustn't have engrossed you mustn't have engrossed he mustn't have engrossed we mustn't have engrossed you mustn't have engrossed they mustn't have engrossed	I mustn't have been engrossing you mustn't have been engrossing he mustn't have been engrossing we mustn't have been engrossing you mustn't have been engrossing they mustn't have been engrossing

Interrogative form

Simple form	V-ing form
must I engross? must you engross? must he engross? must we engross? must you engross? must they engross?	must I be engrossing? must you be engrossing? must he 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 he 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 he 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
mustn't I engross? mustn't you engross? mustn't he engross? mustn't we engross? mustn't you engross? mustn't they engross?	mustn't I be engrossing? mustn't you be engrossing? mustn't he be engrossing? mustn't we be engrossing? mustn't you be engrossing? mustn't they be engrossing?
Perfect	V-ing perfect
mustn't I have engrossed? mustn't you have engrossed? mustn't he have engrossed? mustn't we have engrossed? mustn't you have engrossed? mustn't they have engrossed?	mustn't I have been engrossing? mustn't you have been engrossing? mustn't he have been engrossing? mustn't we have been engrossing? mustn't you have been engrossing? mustn't they have been engrossing?