could upgrade
Verbo regular: upgrade - upgraded- upgraded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could upgrade
you could upgrade
he could upgrade
we could upgrade
you could upgrade
they could upgrade 	I could be upgrading
you could be upgrading
he could be upgrading
we could be upgrading
you could be upgrading
they could be upgrading	I could have upgraded
you could have upgraded
he could have upgraded
we could have upgraded
you could have upgraded
they could have upgraded	I could have been upgrading
you could have been upgrading
he could have been upgrading
we could have been upgrading
you could have been upgrading
they could have been upgrading	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not upgrade
you could not upgrade
he could not upgrade
we could not upgrade
you could not upgrade
they could not upgrade 	I could not be upgrading
you could not be upgrading
he could not be upgrading
we could not be upgrading
you could not be upgrading
they could not be upgrading	I could not have upgraded
you could not have upgraded
he could not have upgraded
we could not have upgraded
you could not have upgraded
they could not have upgraded	I could not have been upgrading
you could not have been upgrading
he could not have been upgrading
we could not have been upgrading
you could not have been upgrading
they could not have been upgrading	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I upgrade?
could you upgrade?
could he upgrade?
could we upgrade?
could you upgrade?
could they upgrade? 	could I be upgrading?
could you be upgrading?
could he be upgrading?
could we be upgrading?
could you be upgrading?
could they be upgrading? 	could I have upgraded?
could you have upgraded?
could he have upgraded?
could we have upgraded?
could you have upgraded?
could they have upgraded? 	could I have been upgrading?
could you have been upgrading?
could he have been upgrading?
could we have been upgrading?
could you have been upgrading?
could they have been upgrading? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not upgrade?
could you not upgrade?
could he not upgrade?
could we not upgrade?
could you not upgrade?
could they not upgrade? 	could I not be upgrading?
could you not be upgrading?
could he not be upgrading?
could we not be upgrading?
could you not be upgrading?
could they not be upgrading? 	could I not have upgraded?
could you not have upgraded?
could he not have upgraded?
could we not have upgraded?
could you not have upgraded?
could they not have upgraded? 	could I not have been upgrading?
could you not have been upgrading?
could he not have been upgrading?
could we not have been upgrading?
could you not have been upgrading?
could they not have been upgrading?