could scale
Verbo regular: scale - scaled- scaled

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could scale
you could scale
he could scale
we could scale
you could scale
they could scale 	I could be scaling
you could be scaling
he could be scaling
we could be scaling
you could be scaling
they could be scaling	I could have scaled
you could have scaled
he could have scaled
we could have scaled
you could have scaled
they could have scaled	I could have been scaling
you could have been scaling
he could have been scaling
we could have been scaling
you could have been scaling
they could have been scaling	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not scale
you could not scale
he could not scale
we could not scale
you could not scale
they could not scale 	I could not be scaling
you could not be scaling
he could not be scaling
we could not be scaling
you could not be scaling
they could not be scaling	I could not have scaled
you could not have scaled
he could not have scaled
we could not have scaled
you could not have scaled
they could not have scaled	I could not have been scaling
you could not have been scaling
he could not have been scaling
we could not have been scaling
you could not have been scaling
they could not have been scaling	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I scale?
could you scale?
could he scale?
could we scale?
could you scale?
could they scale? 	could I be scaling?
could you be scaling?
could he be scaling?
could we be scaling?
could you be scaling?
could they be scaling? 	could I have scaled?
could you have scaled?
could he have scaled?
could we have scaled?
could you have scaled?
could they have scaled? 	could I have been scaling?
could you have been scaling?
could he have been scaling?
could we have been scaling?
could you have been scaling?
could they have been scaling? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not scale?
could you not scale?
could he not scale?
could we not scale?
could you not scale?
could they not scale? 	could I not be scaling?
could you not be scaling?
could he not be scaling?
could we not be scaling?
could you not be scaling?
could they not be scaling? 	could I not have scaled?
could you not have scaled?
could he not have scaled?
could we not have scaled?
could you not have scaled?
could they not have scaled? 	could I not have been scaling?
could you not have been scaling?
could he not have been scaling?
could we not have been scaling?
could you not have been scaling?
could they not have been scaling?