Conjugación del verbo inglés
COULD ADD

Verbo regular: add - added - added

Afirmación

Forma simple	Forma con V-ing
I could add you could add he could add we could add you could add they could add	I could be adding you could be adding he could be adding we could be adding you could be adding they could be adding
Perfecto	Perfecto con V-ing
I could have added you could have added he could have added we could have added you could have added they could have added	I could have been adding you could have been adding he could have been adding we could have been adding you could have been adding they could have been adding

Negación

Forma simple	Forma con V-ing
I could not add you could not add he could not add we could not add you could not add they could not add	I could not be adding you could not be adding he could not be adding we could not be adding you could not be adding they could not be adding
Perfecto	Perfecto con V-ing
I could not have added you could not have added he could not have added we could not have added you could not have added they could not have added	I could not have been adding you could not have been adding he could not have been adding we could not have been adding you could not have been adding they could not have been adding

Forma interrogativa

Forma simple	Forma con V-ing
could I add? could you add? could he add? could we add? could you add? could they add?	could I be adding? could you be adding? could he be adding? could we be adding? could you be adding? could they be adding?
Perfecto	Perfecto con V-ing
could I have added? could you have added? could he have added? could we have added? could you have added? could they have added?	could I have been adding? could you have been adding? could he have been adding? could we have been adding? could you have been adding? could they have been adding?

Forma interro-negativa

Forma simple	Forma con V-ing
could I not add? could you not add? could he not add? could we not add? could you not add? could they not add?	could I not be adding? could you not be adding? could he not be adding? could we not be adding? could you not be adding? could they not be adding?
Perfecto	Perfecto con V-ing
could I not have added? could you not have added? could he not have added? could we not have added? could you not have added? could they not have added?	could I not have been adding? could you not have been adding? could he not have been adding? could we not have been adding? could you not have been adding? could they not have been adding?