English verb conjugation
COULD ENGROSS

Regular verb: engross - engrossed - engrossed

Affirmation

Simple form	V-ing form
I could engross you could engross she could engross we could engross you could engross they could engross	I could be engrossing you could be engrossing she 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 she 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 she 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 couldn't engross you couldn't engross she couldn't engross we couldn't engross you couldn't engross they couldn't engross	I couldn't be engrossing you couldn't be engrossing she couldn't be engrossing we couldn't be engrossing you couldn't be engrossing they couldn't be engrossing
Perfect	V-ing perfect
I couldn't have engrossed you couldn't have engrossed she couldn't have engrossed we couldn't have engrossed you couldn't have engrossed they couldn't have engrossed	I couldn't have been engrossing you couldn't have been engrossing she couldn't have been engrossing we couldn't have been engrossing you couldn't have been engrossing they couldn't have been engrossing

Interrogative form

Simple form	V-ing form
could I engross? could you engross? could she engross? could we engross? could you engross? could they engross?	could I be engrossing? could you be engrossing? could she 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 she 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 she 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
couldn't I engross? couldn't you engross? couldn't she engross? couldn't we engross? couldn't you engross? couldn't they engross?	couldn't I be engrossing? couldn't you be engrossing? couldn't she be engrossing? couldn't we be engrossing? couldn't you be engrossing? couldn't they be engrossing?
Perfect	V-ing perfect
couldn't I have engrossed? couldn't you have engrossed? couldn't she have engrossed? couldn't we have engrossed? couldn't you have engrossed? couldn't they have engrossed?	couldn't I have been engrossing? couldn't you have been engrossing? couldn't she have been engrossing? couldn't we have been engrossing? couldn't you have been engrossing? couldn't they have been engrossing?