I could blacken you could blacken he could blacken we could blacken you could blacken they could blacken
Forma com V-ing
I could be blackening you could be blackening he could be blackening we could be blackening you could be blackening they could be blackening
Perfeito
I could have blackened you could have blackened he could have blackened we could have blackened you could have blackened they could have blackened
Perfeito com V-ing
I could have been blackening you could have been blackening he could have been blackening we could have been blackening you could have been blackening they could have been blackening
Negação
Forma simple
I couldn't blacken you couldn't blacken he couldn't blacken we couldn't blacken you couldn't blacken they couldn't blacken
Forma com V-ing
I couldn't be blackening you couldn't be blackening he couldn't be blackening we couldn't be blackening you couldn't be blackening they couldn't be blackening
Perfeito
I couldn't have blackened you couldn't have blackened he couldn't have blackened we couldn't have blackened you couldn't have blackened they couldn't have blackened
Perfeito com V-ing
I couldn't have been blackening you couldn't have been blackening he couldn't have been blackening we couldn't have been blackening you couldn't have been blackening they couldn't have been blackening
Forma interrogativa
Forma simple
could I blacken? could you blacken? could he blacken? could we blacken? could you blacken? could they blacken?
Forma com V-ing
could I be blackening? could you be blackening? could he be blackening? could we be blackening? could you be blackening? could they be blackening?
Perfeito
could I have blackened? could you have blackened? could he have blackened? could we have blackened? could you have blackened? could they have blackened?
Perfeito com V-ing
could I have been blackening? could you have been blackening? could he have been blackening? could we have been blackening? could you have been blackening? could they have been blackening?
Forma interro-Negação
Forma simple
couldn't I blacken? couldn't you blacken? couldn't he blacken? couldn't we blacken? couldn't you blacken? couldn't they blacken?
Forma com V-ing
couldn't I be blackening? couldn't you be blackening? couldn't he be blackening? couldn't we be blackening? couldn't you be blackening? couldn't they be blackening?
Perfeito
couldn't I have blackened? couldn't you have blackened? couldn't he have blackened? couldn't we have blackened? couldn't you have blackened? couldn't they have blackened?
Perfeito com V-ing
couldn't I have been blackening? couldn't you have been blackening? couldn't he have been blackening? couldn't we have been blackening? couldn't you have been blackening? couldn't they have been blackening?