English verb conjugation
COULD INGRAIN

Regular verb: ingrain - ingrained - ingrained

Affirmation

Simple form	V-ing form
I could ingrain you could ingrain she could ingrain we could ingrain you could ingrain they could ingrain	I could be ingraining you could be ingraining she could be ingraining we could be ingraining you could be ingraining they could be ingraining
Perfect	V-ing perfect
I could have ingrained you could have ingrained she could have ingrained we could have ingrained you could have ingrained they could have ingrained	I could have been ingraining you could have been ingraining she could have been ingraining we could have been ingraining you could have been ingraining they could have been ingraining

Negation

Simple form	V-ing form
I couldn't ingrain you couldn't ingrain she couldn't ingrain we couldn't ingrain you couldn't ingrain they couldn't ingrain	I couldn't be ingraining you couldn't be ingraining she couldn't be ingraining we couldn't be ingraining you couldn't be ingraining they couldn't be ingraining
Perfect	V-ing perfect
I couldn't have ingrained you couldn't have ingrained she couldn't have ingrained we couldn't have ingrained you couldn't have ingrained they couldn't have ingrained	I couldn't have been ingraining you couldn't have been ingraining she couldn't have been ingraining we couldn't have been ingraining you couldn't have been ingraining they couldn't have been ingraining

Interrogative form

Simple form	V-ing form
could I ingrain? could you ingrain? could she ingrain? could we ingrain? could you ingrain? could they ingrain?	could I be ingraining? could you be ingraining? could she be ingraining? could we be ingraining? could you be ingraining? could they be ingraining?
Perfect	V-ing perfect
could I have ingrained? could you have ingrained? could she have ingrained? could we have ingrained? could you have ingrained? could they have ingrained?	could I have been ingraining? could you have been ingraining? could she have been ingraining? could we have been ingraining? could you have been ingraining? could they have been ingraining?

Interro-negative form

Simple form	V-ing form
couldn't I ingrain? couldn't you ingrain? couldn't she ingrain? couldn't we ingrain? couldn't you ingrain? couldn't they ingrain?	couldn't I be ingraining? couldn't you be ingraining? couldn't she be ingraining? couldn't we be ingraining? couldn't you be ingraining? couldn't they be ingraining?
Perfect	V-ing perfect
couldn't I have ingrained? couldn't you have ingrained? couldn't she have ingrained? couldn't we have ingrained? couldn't you have ingrained? couldn't they have ingrained?	couldn't I have been ingraining? couldn't you have been ingraining? couldn't she have been ingraining? couldn't we have been ingraining? couldn't you have been ingraining? couldn't they have been ingraining?