I could attach you could attach he could attach we could attach you could attach they could attach
Forma con V-ing
I could be attaching you could be attaching he could be attaching we could be attaching you could be attaching they could be attaching
Perfecto
I could have attached you could have attached he could have attached we could have attached you could have attached they could have attached
Perfecto con V-ing
I could have been attaching you could have been attaching he could have been attaching we could have been attaching you could have been attaching they could have been attaching
Negación
Forma simple
I couldn't attach you couldn't attach he couldn't attach we couldn't attach you couldn't attach they couldn't attach
Forma con V-ing
I couldn't be attaching you couldn't be attaching he couldn't be attaching we couldn't be attaching you couldn't be attaching they couldn't be attaching
Perfecto
I couldn't have attached you couldn't have attached he couldn't have attached we couldn't have attached you couldn't have attached they couldn't have attached
Perfecto con V-ing
I couldn't have been attaching you couldn't have been attaching he couldn't have been attaching we couldn't have been attaching you couldn't have been attaching they couldn't have been attaching
Forma interrogativa
Forma simple
could I attach? could you attach? could he attach? could we attach? could you attach? could they attach?
Forma con V-ing
could I be attaching? could you be attaching? could he be attaching? could we be attaching? could you be attaching? could they be attaching?
Perfecto
could I have attached? could you have attached? could he have attached? could we have attached? could you have attached? could they have attached?
Perfecto con V-ing
could I have been attaching? could you have been attaching? could he have been attaching? could we have been attaching? could you have been attaching? could they have been attaching?
Forma interro-negativa
Forma simple
couldn't I attach? couldn't you attach? couldn't he attach? couldn't we attach? couldn't you attach? couldn't they attach?
Forma con V-ing
couldn't I be attaching? couldn't you be attaching? couldn't he be attaching? couldn't we be attaching? couldn't you be attaching? couldn't they be attaching?
Perfecto
couldn't I have attached? couldn't you have attached? couldn't he have attached? couldn't we have attached? couldn't you have attached? couldn't they have attached?
Perfecto con V-ing
couldn't I have been attaching? couldn't you have been attaching? couldn't he have been attaching? couldn't we have been attaching? couldn't you have been attaching? couldn't they have been attaching?