I could contend you could contend he could contend we could contend you could contend they could contend
Forma con V-ing
I could be contending you could be contending he could be contending we could be contending you could be contending they could be contending
Perfecto
I could have contended you could have contended he could have contended we could have contended you could have contended they could have contended
Perfecto con V-ing
I could have been contending you could have been contending he could have been contending we could have been contending you could have been contending they could have been contending
Negación
Forma simple
I could not contend you could not contend he could not contend we could not contend you could not contend they could not contend
Forma con V-ing
I could not be contending you could not be contending he could not be contending we could not be contending you could not be contending they could not be contending
Perfecto
I could not have contended you could not have contended he could not have contended we could not have contended you could not have contended they could not have contended
Perfecto con V-ing
I could not have been contending you could not have been contending he could not have been contending we could not have been contending you could not have been contending they could not have been contending
Forma interrogativa
Forma simple
could I contend? could you contend? could he contend? could we contend? could you contend? could they contend?
Forma con V-ing
could I be contending? could you be contending? could he be contending? could we be contending? could you be contending? could they be contending?
Perfecto
could I have contended? could you have contended? could he have contended? could we have contended? could you have contended? could they have contended?
Perfecto con V-ing
could I have been contending? could you have been contending? could he have been contending? could we have been contending? could you have been contending? could they have been contending?
Forma interro-negativa
Forma simple
could I not contend? could you not contend? could he not contend? could we not contend? could you not contend? could they not contend?
Forma con V-ing
could I not be contending? could you not be contending? could he not be contending? could we not be contending? could you not be contending? could they not be contending?
Perfecto
could I not have contended? could you not have contended? could he not have contended? could we not have contended? could you not have contended? could they not have contended?
Perfecto con V-ing
could I not have been contending? could you not have been contending? could he not have been contending? could we not have been contending? could you not have been contending? could they not have been contending?