English verb conjugation
COULD ENGRAIN

Regular verb: engrain - engrained - engrained

Affirmation

Simple form	V-ing form
I could engrain you could engrain he could engrain we could engrain you could engrain they could engrain	I could be engraining you could be engraining he could be engraining we could be engraining you could be engraining they could be engraining
Perfect	V-ing perfect
I could have engrained you could have engrained he could have engrained we could have engrained you could have engrained they could have engrained	I could have been engraining you could have been engraining he could have been engraining we could have been engraining you could have been engraining they could have been engraining

Negation

Simple form	V-ing form
I couldn't engrain you couldn't engrain he couldn't engrain we couldn't engrain you couldn't engrain they couldn't engrain	I couldn't be engraining you couldn't be engraining he couldn't be engraining we couldn't be engraining you couldn't be engraining they couldn't be engraining
Perfect	V-ing perfect
I couldn't have engrained you couldn't have engrained he couldn't have engrained we couldn't have engrained you couldn't have engrained they couldn't have engrained	I couldn't have been engraining you couldn't have been engraining he couldn't have been engraining we couldn't have been engraining you couldn't have been engraining they couldn't have been engraining

Interrogative form

Simple form	V-ing form
could I engrain? could you engrain? could he engrain? could we engrain? could you engrain? could they engrain?	could I be engraining? could you be engraining? could he be engraining? could we be engraining? could you be engraining? could they be engraining?
Perfect	V-ing perfect
could I have engrained? could you have engrained? could he have engrained? could we have engrained? could you have engrained? could they have engrained?	could I have been engraining? could you have been engraining? could he have been engraining? could we have been engraining? could you have been engraining? could they have been engraining?

Interro-negative form

Simple form	V-ing form
couldn't I engrain? couldn't you engrain? couldn't he engrain? couldn't we engrain? couldn't you engrain? couldn't they engrain?	couldn't I be engraining? couldn't you be engraining? couldn't he be engraining? couldn't we be engraining? couldn't you be engraining? couldn't they be engraining?
Perfect	V-ing perfect
couldn't I have engrained? couldn't you have engrained? couldn't he have engrained? couldn't we have engrained? couldn't you have engrained? couldn't they have engrained?	couldn't I have been engraining? couldn't you have been engraining? couldn't he have been engraining? couldn't we have been engraining? couldn't you have been engraining? couldn't they have been engraining?