English verb conjugation
COULD ENGRAFT

Regular verb: engraft - engrafted - engrafted

Affirmation

Simple form	V-ing form
I could engraft you could engraft he could engraft we could engraft you could engraft they could engraft	I could be engrafting you could be engrafting he could be engrafting we could be engrafting you could be engrafting they could be engrafting
Perfect	V-ing perfect
I could have engrafted you could have engrafted he could have engrafted we could have engrafted you could have engrafted they could have engrafted	I could have been engrafting you could have been engrafting he could have been engrafting we could have been engrafting you could have been engrafting they could have been engrafting

Negation

Simple form	V-ing form
I could not engraft you could not engraft he could not engraft we could not engraft you could not engraft they could not engraft	I could not be engrafting you could not be engrafting he could not be engrafting we could not be engrafting you could not be engrafting they could not be engrafting
Perfect	V-ing perfect
I could not have engrafted you could not have engrafted he could not have engrafted we could not have engrafted you could not have engrafted they could not have engrafted	I could not have been engrafting you could not have been engrafting he could not have been engrafting we could not have been engrafting you could not have been engrafting they could not have been engrafting

Interrogative form

Simple form	V-ing form
could I engraft? could you engraft? could he engraft? could we engraft? could you engraft? could they engraft?	could I be engrafting? could you be engrafting? could he be engrafting? could we be engrafting? could you be engrafting? could they be engrafting?
Perfect	V-ing perfect
could I have engrafted? could you have engrafted? could he have engrafted? could we have engrafted? could you have engrafted? could they have engrafted?	could I have been engrafting? could you have been engrafting? could he have been engrafting? could we have been engrafting? could you have been engrafting? could they have been engrafting?

Interro-negative form

Simple form	V-ing form
could I not engraft? could you not engraft? could he not engraft? could we not engraft? could you not engraft? could they not engraft?	could I not be engrafting? could you not be engrafting? could he not be engrafting? could we not be engrafting? could you not be engrafting? could they not be engrafting?
Perfect	V-ing perfect
could I not have engrafted? could you not have engrafted? could he not have engrafted? could we not have engrafted? could you not have engrafted? could they not have engrafted?	could I not have been engrafting? could you not have been engrafting? could he not have been engrafting? could we not have been engrafting? could you not have been engrafting? could they not have been engrafting?