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 couldn't engraft you couldn't engraft he couldn't engraft we couldn't engraft you couldn't engraft they couldn't engraft	I couldn't be engrafting you couldn't be engrafting he couldn't be engrafting we couldn't be engrafting you couldn't be engrafting they couldn't be engrafting
Perfect	V-ing perfect
I couldn't have engrafted you couldn't have engrafted he couldn't have engrafted we couldn't have engrafted you couldn't have engrafted they couldn't have engrafted	I couldn't have been engrafting you couldn't have been engrafting he couldn't have been engrafting we couldn't have been engrafting you couldn't have been engrafting they couldn't 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
couldn't I engraft? couldn't you engraft? couldn't he engraft? couldn't we engraft? couldn't you engraft? couldn't they engraft?	couldn't I be engrafting? couldn't you be engrafting? couldn't he be engrafting? couldn't we be engrafting? couldn't you be engrafting? couldn't they be engrafting?
Perfect	V-ing perfect
couldn't I have engrafted? couldn't you have engrafted? couldn't he have engrafted? couldn't we have engrafted? couldn't you have engrafted? couldn't they have engrafted?	couldn't I have been engrafting? couldn't you have been engrafting? couldn't he have been engrafting? couldn't we have been engrafting? couldn't you have been engrafting? couldn't they have been engrafting?