Conjugação do verbo inglês
COULD ERR

Verbo regular: err - erred - erred

Afirmação

Forma simple	Forma com V-ing
I could err you could err she could err we could err you could err they could err	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	Perfeito com V-ing
I could have erred you could have erred she could have erred we could have erred you could have erred they could have erred	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	Forma com V-ing
I could not err you could not err she could not err we could not err you could not err they could not err	I could not be erring you could not be erring she could not be erring we could not be erring you could not be erring they could not be erring
Perfeito	Perfeito com V-ing
I could not have erred you could not have erred she could not have erred we could not have erred you could not have erred they could not have erred	I could not have been erring you could not have been erring she could not have been erring we could not have been erring you could not have been erring they could not have been erring

Forma interrogativa

Forma simple	Forma com V-ing
could I err? could you err? could she err? could we err? could you err? could they err?	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	Perfeito com V-ing
could I have erred? could you have erred? could she have erred? could we have erred? could you have erred? could they have erred?	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	Forma com V-ing
could I not err? could you not err? could she not err? could we not err? could you not err? could they not err?	could I not be erring? could you not be erring? could she not be erring? could we not be erring? could you not be erring? could they not be erring?
Perfeito	Perfeito com V-ing
could I not have erred? could you not have erred? could she not have erred? could we not have erred? could you not have erred? could they not have erred?	could I not have been erring? could you not have been erring? could she not have been erring? could we not have been erring? could you not have been erring? could they not have been erring?