I could echo you could echo she could echo we could echo you could echo they could echo
Forma con V-ing
I could be echoing you could be echoing she could be echoing we could be echoing you could be echoing they could be echoing
Perfecto
I could have echoed you could have echoed she could have echoed we could have echoed you could have echoed they could have echoed
Perfecto con V-ing
I could have been echoing you could have been echoing she could have been echoing we could have been echoing you could have been echoing they could have been echoing
Negación
Forma simple
I could not echo you could not echo she could not echo we could not echo you could not echo they could not echo
Forma con V-ing
I could not be echoing you could not be echoing she could not be echoing we could not be echoing you could not be echoing they could not be echoing
Perfecto
I could not have echoed you could not have echoed she could not have echoed we could not have echoed you could not have echoed they could not have echoed
Perfecto con V-ing
I could not have been echoing you could not have been echoing she could not have been echoing we could not have been echoing you could not have been echoing they could not have been echoing
Forma interrogativa
Forma simple
could I echo? could you echo? could she echo? could we echo? could you echo? could they echo?
Forma con V-ing
could I be echoing? could you be echoing? could she be echoing? could we be echoing? could you be echoing? could they be echoing?
Perfecto
could I have echoed? could you have echoed? could she have echoed? could we have echoed? could you have echoed? could they have echoed?
Perfecto con V-ing
could I have been echoing? could you have been echoing? could she have been echoing? could we have been echoing? could you have been echoing? could they have been echoing?
Forma interro-negativa
Forma simple
could I not echo? could you not echo? could she not echo? could we not echo? could you not echo? could they not echo?
Forma con V-ing
could I not be echoing? could you not be echoing? could she not be echoing? could we not be echoing? could you not be echoing? could they not be echoing?
Perfecto
could I not have echoed? could you not have echoed? could she not have echoed? could we not have echoed? could you not have echoed? could they not have echoed?
Perfecto con V-ing
could I not have been echoing? could you not have been echoing? could she not have been echoing? could we not have been echoing? could you not have been echoing? could they not have been echoing?