I could err you could err she could err we could err you could err they could err
Forma com V-ing
I could be erring you could be erring she could be erring we could be erring you could be erring they could be erring
Perfeito
I could have erred you could have erred she could have erred we could have erred you could have erred they could have erred
Perfeito com V-ing
I could have been erring you could have been erring she could have been erring we could have been erring you could have been erring they could have been erring
Negação
Forma simple
I couldn't err you couldn't err she couldn't err we couldn't err you couldn't err they couldn't err
Forma com V-ing
I couldn't be erring you couldn't be erring she couldn't be erring we couldn't be erring you couldn't be erring they couldn't be erring
Perfeito
I couldn't have erred you couldn't have erred she couldn't have erred we couldn't have erred you couldn't have erred they couldn't have erred
Perfeito com V-ing
I couldn't have been erring you couldn't have been erring she couldn't have been erring we couldn't have been erring you couldn't have been erring they couldn't have been erring
Forma interrogativa
Forma simple
could I err? could you err? could she err? could we err? could you err? could they err?
Forma com V-ing
could I be erring? could you be erring? could she be erring? could we be erring? could you be erring? could they be erring?
Perfeito
could I have erred? could you have erred? could she have erred? could we have erred? could you have erred? could they have erred?
Perfeito com V-ing
could I have been erring? could you have been erring? could she have been erring? could we have been erring? could you have been erring? could they have been erring?
Forma interro-Negação
Forma simple
couldn't I err? couldn't you err? couldn't she err? couldn't we err? couldn't you err? couldn't they err?
Forma com V-ing
couldn't I be erring? couldn't you be erring? couldn't she be erring? couldn't we be erring? couldn't you be erring? couldn't they be erring?
Perfeito
couldn't I have erred? couldn't you have erred? couldn't she have erred? couldn't we have erred? couldn't you have erred? couldn't they have erred?
Perfeito com V-ing
couldn't I have been erring? couldn't you have been erring? couldn't she have been erring? couldn't we have been erring? couldn't you have been erring? couldn't they have been erring?