English verb conjugation
COULD ENGRAIN

Regular verb: engrain - engrained - engrained

Affirmation

Simple form	V-ing form
I could engrain you could engrain she could engrain we could engrain you could engrain they could engrain	I could be engraining you could be engraining she 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 she 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 she 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 she 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 she 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 she 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 she 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 she engrain? could we engrain? could you engrain? could they engrain?	could I be engraining? could you be engraining? could she 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 she 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 she 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 she 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 she 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 she 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 she have been engraining? couldn't we have been engraining? couldn't you have been engraining? couldn't they have been engraining?