I could graft you could graft she could graft we could graft you could graft they could graft
Forma con V-ing
I could be grafting you could be grafting she could be grafting we could be grafting you could be grafting they could be grafting
Perfecto
I could have grafted you could have grafted she could have grafted we could have grafted you could have grafted they could have grafted
Perfecto con V-ing
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
Negación
Forma simple
I couldn't graft you couldn't graft she couldn't graft we couldn't graft you couldn't graft they couldn't graft
Forma con V-ing
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
Perfecto
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
Perfecto con V-ing
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
Forma interrogativa
Forma simple
could I graft? could you graft? could she graft? could we graft? could you graft? could they graft?
Forma con V-ing
could I be grafting? could you be grafting? could she be grafting? could we be grafting? could you be grafting? could they be grafting?
Perfecto
could I have grafted? could you have grafted? could she have grafted? could we have grafted? could you have grafted? could they have grafted?
Perfecto con V-ing
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?
Forma interro-negativa
Forma simple
couldn't I graft? couldn't you graft? couldn't she graft? couldn't we graft? couldn't you graft? couldn't they graft?
Forma con V-ing
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?
Perfecto
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?
Perfecto con V-ing
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?