could upright
Verbo regular: upright - uprighted- uprighted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could upright
you could upright
he could upright
we could upright
you could upright
they could upright 	I could be uprighting
you could be uprighting
he could be uprighting
we could be uprighting
you could be uprighting
they could be uprighting	I could have uprighted
you could have uprighted
he could have uprighted
we could have uprighted
you could have uprighted
they could have uprighted	I could have been uprighting
you could have been uprighting
he could have been uprighting
we could have been uprighting
you could have been uprighting
they could have been uprighting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not upright
you could not upright
he could not upright
we could not upright
you could not upright
they could not upright 	I could not be uprighting
you could not be uprighting
he could not be uprighting
we could not be uprighting
you could not be uprighting
they could not be uprighting	I could not have uprighted
you could not have uprighted
he could not have uprighted
we could not have uprighted
you could not have uprighted
they could not have uprighted	I could not have been uprighting
you could not have been uprighting
he could not have been uprighting
we could not have been uprighting
you could not have been uprighting
they could not have been uprighting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I upright?
could you upright?
could he upright?
could we upright?
could you upright?
could they upright? 	could I be uprighting?
could you be uprighting?
could he be uprighting?
could we be uprighting?
could you be uprighting?
could they be uprighting? 	could I have uprighted?
could you have uprighted?
could he have uprighted?
could we have uprighted?
could you have uprighted?
could they have uprighted? 	could I have been uprighting?
could you have been uprighting?
could he have been uprighting?
could we have been uprighting?
could you have been uprighting?
could they have been uprighting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not upright?
could you not upright?
could he not upright?
could we not upright?
could you not upright?
could they not upright? 	could I not be uprighting?
could you not be uprighting?
could he not be uprighting?
could we not be uprighting?
could you not be uprighting?
could they not be uprighting? 	could I not have uprighted?
could you not have uprighted?
could he not have uprighted?
could we not have uprighted?
could you not have uprighted?
could they not have uprighted? 	could I not have been uprighting?
could you not have been uprighting?
could he not have been uprighting?
could we not have been uprighting?
could you not have been uprighting?
could they not have been uprighting?