could scale
Verbo regular: scale - scaled- scaled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't scale
you couldn't scale
he couldn't scale
we couldn't scale
you couldn't scale
they couldn't scale 	I couldn't be scaling
you couldn't be scaling
he couldn't be scaling
we couldn't be scaling
you couldn't be scaling
they couldn't be scaling	I couldn't have scaled
you couldn't have scaled
he couldn't have scaled
we couldn't have scaled
you couldn't have scaled
they couldn't have scaled	I couldn't have been scaling
you couldn't have been scaling
he couldn't have been scaling
we couldn't have been scaling
you couldn't have been scaling
they couldn't have been scaling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I scale?
couldn't you scale?
couldn't he scale?
couldn't we scale?
couldn't you scale?
couldn't they scale? 	couldn't I be scaling?
couldn't you be scaling?
couldn't he be scaling?
couldn't we be scaling?
couldn't you be scaling?
couldn't they be scaling? 	couldn't I have scaled?
couldn't you have scaled?
couldn't he have scaled?
couldn't we have scaled?
couldn't you have scaled?
couldn't they have scaled? 	couldn't I have been scaling?
couldn't you have been scaling?
couldn't he have been scaling?
couldn't we have been scaling?
couldn't you have been scaling?
couldn't they have been scaling?