English verb conjugation
COULD INTERGRAFT

Regular verb: intergraft - intergrafted - intergrafted

Affirmation

Simple form	V-ing form
I could intergraft you could intergraft she could intergraft we could intergraft you could intergraft they could intergraft	I could be intergrafting you could be intergrafting she could be intergrafting we could be intergrafting you could be intergrafting they could be intergrafting
Perfect	V-ing perfect
I could have intergrafted you could have intergrafted she could have intergrafted we could have intergrafted you could have intergrafted they could have intergrafted	I could have been intergrafting you could have been intergrafting she could have been intergrafting we could have been intergrafting you could have been intergrafting they could have been intergrafting

Negation

Simple form	V-ing form
I couldn't intergraft you couldn't intergraft she couldn't intergraft we couldn't intergraft you couldn't intergraft they couldn't intergraft	I couldn't be intergrafting you couldn't be intergrafting she couldn't be intergrafting we couldn't be intergrafting you couldn't be intergrafting they couldn't be intergrafting
Perfect	V-ing perfect
I couldn't have intergrafted you couldn't have intergrafted she couldn't have intergrafted we couldn't have intergrafted you couldn't have intergrafted they couldn't have intergrafted	I couldn't have been intergrafting you couldn't have been intergrafting she couldn't have been intergrafting we couldn't have been intergrafting you couldn't have been intergrafting they couldn't have been intergrafting

Interrogative form

Simple form	V-ing form
could I intergraft? could you intergraft? could she intergraft? could we intergraft? could you intergraft? could they intergraft?	could I be intergrafting? could you be intergrafting? could she be intergrafting? could we be intergrafting? could you be intergrafting? could they be intergrafting?
Perfect	V-ing perfect
could I have intergrafted? could you have intergrafted? could she have intergrafted? could we have intergrafted? could you have intergrafted? could they have intergrafted?	could I have been intergrafting? could you have been intergrafting? could she have been intergrafting? could we have been intergrafting? could you have been intergrafting? could they have been intergrafting?

Interro-negative form

Simple form	V-ing form
couldn't I intergraft? couldn't you intergraft? couldn't she intergraft? couldn't we intergraft? couldn't you intergraft? couldn't they intergraft?	couldn't I be intergrafting? couldn't you be intergrafting? couldn't she be intergrafting? couldn't we be intergrafting? couldn't you be intergrafting? couldn't they be intergrafting?
Perfect	V-ing perfect
couldn't I have intergrafted? couldn't you have intergrafted? couldn't she have intergrafted? couldn't we have intergrafted? couldn't you have intergrafted? couldn't they have intergrafted?	couldn't I have been intergrafting? couldn't you have been intergrafting? couldn't she have been intergrafting? couldn't we have been intergrafting? couldn't you have been intergrafting? couldn't they have been intergrafting?