I could mason you could mason he could mason we could mason you could mason they could mason
Forma con V-ing
I could be masoning you could be masoning he could be masoning we could be masoning you could be masoning they could be masoning
Perfecto
I could have masoned you could have masoned he could have masoned we could have masoned you could have masoned they could have masoned
Perfecto con V-ing
I could have been masoning you could have been masoning he could have been masoning we could have been masoning you could have been masoning they could have been masoning
Negación
Forma simple
I could not mason you could not mason he could not mason we could not mason you could not mason they could not mason
Forma con V-ing
I could not be masoning you could not be masoning he could not be masoning we could not be masoning you could not be masoning they could not be masoning
Perfecto
I could not have masoned you could not have masoned he could not have masoned we could not have masoned you could not have masoned they could not have masoned
Perfecto con V-ing
I could not have been masoning you could not have been masoning he could not have been masoning we could not have been masoning you could not have been masoning they could not have been masoning
Forma interrogativa
Forma simple
could I mason? could you mason? could he mason? could we mason? could you mason? could they mason?
Forma con V-ing
could I be masoning? could you be masoning? could he be masoning? could we be masoning? could you be masoning? could they be masoning?
Perfecto
could I have masoned? could you have masoned? could he have masoned? could we have masoned? could you have masoned? could they have masoned?
Perfecto con V-ing
could I have been masoning? could you have been masoning? could he have been masoning? could we have been masoning? could you have been masoning? could they have been masoning?
Forma interro-negativa
Forma simple
could I not mason? could you not mason? could he not mason? could we not mason? could you not mason? could they not mason?
Forma con V-ing
could I not be masoning? could you not be masoning? could he not be masoning? could we not be masoning? could you not be masoning? could they not be masoning?
Perfecto
could I not have masoned? could you not have masoned? could he not have masoned? could we not have masoned? could you not have masoned? could they not have masoned?
Perfecto con V-ing
could I not have been masoning? could you not have been masoning? could he not have been masoning? could we not have been masoning? could you not have been masoning? could they not have been masoning?