I could perform you could perform she could perform we could perform you could perform they could perform
Forma con V-ing
I could be performing you could be performing she could be performing we could be performing you could be performing they could be performing
Perfecto
I could have performed you could have performed she could have performed we could have performed you could have performed they could have performed
Perfecto con V-ing
I could have been performing you could have been performing she could have been performing we could have been performing you could have been performing they could have been performing
Negación
Forma simple
I could not perform you could not perform she could not perform we could not perform you could not perform they could not perform
Forma con V-ing
I could not be performing you could not be performing she could not be performing we could not be performing you could not be performing they could not be performing
Perfecto
I could not have performed you could not have performed she could not have performed we could not have performed you could not have performed they could not have performed
Perfecto con V-ing
I could not have been performing you could not have been performing she could not have been performing we could not have been performing you could not have been performing they could not have been performing
Forma interrogativa
Forma simple
could I perform? could you perform? could she perform? could we perform? could you perform? could they perform?
Forma con V-ing
could I be performing? could you be performing? could she be performing? could we be performing? could you be performing? could they be performing?
Perfecto
could I have performed? could you have performed? could she have performed? could we have performed? could you have performed? could they have performed?
Perfecto con V-ing
could I have been performing? could you have been performing? could she have been performing? could we have been performing? could you have been performing? could they have been performing?
Forma interro-negativa
Forma simple
could I not perform? could you not perform? could she not perform? could we not perform? could you not perform? could they not perform?
Forma con V-ing
could I not be performing? could you not be performing? could she not be performing? could we not be performing? could you not be performing? could they not be performing?
Perfecto
could I not have performed? could you not have performed? could she not have performed? could we not have performed? could you not have performed? could they not have performed?
Perfecto con V-ing
could I not have been performing? could you not have been performing? could she not have been performing? could we not have been performing? could you not have been performing? could they not have been performing?