could upgrade
Verbo regular: upgrade - upgraded- upgraded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could upgrade
you could upgrade
she could upgrade
we could upgrade
you could upgrade
they could upgrade 	I could be upgrading
you could be upgrading
she could be upgrading
we could be upgrading
you could be upgrading
they could be upgrading	I could have upgraded
you could have upgraded
she 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
she could have been upgrading
we could have been upgrading
you could have been upgrading
they could have been upgrading	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not upgrade
you could not upgrade
she 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
she 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
she 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
she 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 com V-ing 	Perfeito 	Perfeito com V-ing 	
could I upgrade?
could you upgrade?
could she upgrade?
could we upgrade?
could you upgrade?
could they upgrade? 	could I be upgrading?
could you be upgrading?
could she be upgrading?
could we be upgrading?
could you be upgrading?
could they be upgrading? 	could I have upgraded?
could you have upgraded?
could she 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 she have been upgrading?
could we have been upgrading?
could you have been upgrading?
could they have been upgrading? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not upgrade?
could you not upgrade?
could she 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 she 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 she 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 she not have been upgrading?
could we not have been upgrading?
could you not have been upgrading?
could they not have been upgrading?