I could attend you could attend she could attend we could attend you could attend they could attend
Forma con V-ing
I could be attending you could be attending she could be attending we could be attending you could be attending they could be attending
Perfecto
I could have attended you could have attended she could have attended we could have attended you could have attended they could have attended
Perfecto con V-ing
I could have been attending you could have been attending she could have been attending we could have been attending you could have been attending they could have been attending
Negación
Forma simple
I couldn't attend you couldn't attend she couldn't attend we couldn't attend you couldn't attend they couldn't attend
Forma con V-ing
I couldn't be attending you couldn't be attending she couldn't be attending we couldn't be attending you couldn't be attending they couldn't be attending
Perfecto
I couldn't have attended you couldn't have attended she couldn't have attended we couldn't have attended you couldn't have attended they couldn't have attended
Perfecto con V-ing
I couldn't have been attending you couldn't have been attending she couldn't have been attending we couldn't have been attending you couldn't have been attending they couldn't have been attending
Forma interrogativa
Forma simple
could I attend? could you attend? could she attend? could we attend? could you attend? could they attend?
Forma con V-ing
could I be attending? could you be attending? could she be attending? could we be attending? could you be attending? could they be attending?
Perfecto
could I have attended? could you have attended? could she have attended? could we have attended? could you have attended? could they have attended?
Perfecto con V-ing
could I have been attending? could you have been attending? could she have been attending? could we have been attending? could you have been attending? could they have been attending?
Forma interro-negativa
Forma simple
couldn't I attend? couldn't you attend? couldn't she attend? couldn't we attend? couldn't you attend? couldn't they attend?
Forma con V-ing
couldn't I be attending? couldn't you be attending? couldn't she be attending? couldn't we be attending? couldn't you be attending? couldn't they be attending?
Perfecto
couldn't I have attended? couldn't you have attended? couldn't she have attended? couldn't we have attended? couldn't you have attended? couldn't they have attended?
Perfecto con V-ing
couldn't I have been attending? couldn't you have been attending? couldn't she have been attending? couldn't we have been attending? couldn't you have been attending? couldn't they have been attending?