English verb conjugation
COULD GRAFT

Regular verb: graft - grafted - grafted

Affirmation

Simple form	V-ing form
I could graft you could graft she could graft we could graft you could graft they could graft	I could be grafting you could be grafting she could be grafting we could be grafting you could be grafting they could be grafting
Perfect	V-ing perfect
I could have grafted you could have grafted she could have grafted we could have grafted you could have grafted they could have grafted	I could have been grafting you could have been grafting she could have been grafting we could have been grafting you could have been grafting they could have been grafting

Negation

Simple form	V-ing form
I couldn't graft you couldn't graft she couldn't graft we couldn't graft you couldn't graft they couldn't graft	I couldn't be grafting you couldn't be grafting she couldn't be grafting we couldn't be grafting you couldn't be grafting they couldn't be grafting
Perfect	V-ing perfect
I couldn't have grafted you couldn't have grafted she couldn't have grafted we couldn't have grafted you couldn't have grafted they couldn't have grafted	I couldn't have been grafting you couldn't have been grafting she couldn't have been grafting we couldn't have been grafting you couldn't have been grafting they couldn't have been grafting

Interrogative form

Simple form	V-ing form
could I graft? could you graft? could she graft? could we graft? could you graft? could they graft?	could I be grafting? could you be grafting? could she be grafting? could we be grafting? could you be grafting? could they be grafting?
Perfect	V-ing perfect
could I have grafted? could you have grafted? could she have grafted? could we have grafted? could you have grafted? could they have grafted?	could I have been grafting? could you have been grafting? could she have been grafting? could we have been grafting? could you have been grafting? could they have been grafting?

Interro-negative form

Simple form	V-ing form
couldn't I graft? couldn't you graft? couldn't she graft? couldn't we graft? couldn't you graft? couldn't they graft?	couldn't I be grafting? couldn't you be grafting? couldn't she be grafting? couldn't we be grafting? couldn't you be grafting? couldn't they be grafting?
Perfect	V-ing perfect
couldn't I have grafted? couldn't you have grafted? couldn't she have grafted? couldn't we have grafted? couldn't you have grafted? couldn't they have grafted?	couldn't I have been grafting? couldn't you have been grafting? couldn't she have been grafting? couldn't we have been grafting? couldn't you have been grafting? couldn't they have been grafting?