I could upgrade you could upgrade he could upgrade we could upgrade you could upgrade they could upgrade
Forma com V-ing
I could be upgrading you could be upgrading he could be upgrading we could be upgrading you could be upgrading they could be upgrading
Perfeito
I could have upgraded you could have upgraded he could have upgraded we could have upgraded you could have upgraded they could have upgraded
Perfeito com V-ing
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
Negação
Forma simple
I couldn't upgrade you couldn't upgrade he couldn't upgrade we couldn't upgrade you couldn't upgrade they couldn't upgrade
Forma com V-ing
I couldn't be upgrading you couldn't be upgrading he couldn't be upgrading we couldn't be upgrading you couldn't be upgrading they couldn't be upgrading
Perfeito
I couldn't have upgraded you couldn't have upgraded he couldn't have upgraded we couldn't have upgraded you couldn't have upgraded they couldn't have upgraded
Perfeito com V-ing
I couldn't have been upgrading you couldn't have been upgrading he couldn't have been upgrading we couldn't have been upgrading you couldn't have been upgrading they couldn't have been upgrading
Forma interrogativa
Forma simple
could I upgrade? could you upgrade? could he upgrade? could we upgrade? could you upgrade? could they upgrade?
Forma com V-ing
could I be upgrading? could you be upgrading? could he be upgrading? could we be upgrading? could you be upgrading? could they be upgrading?
Perfeito
could I have upgraded? could you have upgraded? could he have upgraded? could we have upgraded? could you have upgraded? could they have upgraded?
Perfeito com V-ing
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-Negação
Forma simple
couldn't I upgrade? couldn't you upgrade? couldn't he upgrade? couldn't we upgrade? couldn't you upgrade? couldn't they upgrade?
Forma com V-ing
couldn't I be upgrading? couldn't you be upgrading? couldn't he be upgrading? couldn't we be upgrading? couldn't you be upgrading? couldn't they be upgrading?
Perfeito
couldn't I have upgraded? couldn't you have upgraded? couldn't he have upgraded? couldn't we have upgraded? couldn't you have upgraded? couldn't they have upgraded?
Perfeito com V-ing
couldn't I have been upgrading? couldn't you have been upgrading? couldn't he have been upgrading? couldn't we have been upgrading? couldn't you have been upgrading? couldn't they have been upgrading?