English verb conjugation
COULD ENGROSS

Regular verb: engross - engrossed - engrossed

Affirmation

Simple form	V-ing form
I could engross you could engross he could engross we could engross you could engross they could engross	I could be engrossing you could be engrossing he could be engrossing we could be engrossing you could be engrossing they could be engrossing
Perfect	V-ing perfect
I could have engrossed you could have engrossed he could have engrossed we could have engrossed you could have engrossed they could have engrossed	I could have been engrossing you could have been engrossing he could have been engrossing we could have been engrossing you could have been engrossing they could have been engrossing

Negation

Simple form	V-ing form
I could not engross you could not engross he could not engross we could not engross you could not engross they could not engross	I could not be engrossing you could not be engrossing he could not be engrossing we could not be engrossing you could not be engrossing they could not be engrossing
Perfect	V-ing perfect
I could not have engrossed you could not have engrossed he could not have engrossed we could not have engrossed you could not have engrossed they could not have engrossed	I could not have been engrossing you could not have been engrossing he could not have been engrossing we could not have been engrossing you could not have been engrossing they could not have been engrossing

Interrogative form

Simple form	V-ing form
could I engross? could you engross? could he engross? could we engross? could you engross? could they engross?	could I be engrossing? could you be engrossing? could he be engrossing? could we be engrossing? could you be engrossing? could they be engrossing?
Perfect	V-ing perfect
could I have engrossed? could you have engrossed? could he have engrossed? could we have engrossed? could you have engrossed? could they have engrossed?	could I have been engrossing? could you have been engrossing? could he have been engrossing? could we have been engrossing? could you have been engrossing? could they have been engrossing?

Interro-negative form

Simple form	V-ing form
could I not engross? could you not engross? could he not engross? could we not engross? could you not engross? could they not engross?	could I not be engrossing? could you not be engrossing? could he not be engrossing? could we not be engrossing? could you not be engrossing? could they not be engrossing?
Perfect	V-ing perfect
could I not have engrossed? could you not have engrossed? could he not have engrossed? could we not have engrossed? could you not have engrossed? could they not have engrossed?	could I not have been engrossing? could you not have been engrossing? could he not have been engrossing? could we not have been engrossing? could you not have been engrossing? could they not have been engrossing?