Conjugación del verbo inglés
COULD ERR

Verbo regular: err - erred - erred

Afirmación

Forma simple	Forma con V-ing
I could err you could err he could err we could err you could err they could err	I could be erring you could be erring he could be erring we could be erring you could be erring they could be erring
Perfecto	Perfecto con V-ing
I could have erred you could have erred he 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 he could have been erring we could have been erring you could have been erring they could have been erring

Negación

Forma simple	Forma con V-ing
I couldn't err you couldn't err he couldn't err we couldn't err you couldn't err they couldn't err	I couldn't be erring you couldn't be erring he couldn't be erring we couldn't be erring you couldn't be erring they couldn't be erring
Perfecto	Perfecto con V-ing
I couldn't have erred you couldn't have erred he couldn't have erred we couldn't have erred you couldn't have erred they couldn't have erred	I couldn't have been erring you couldn't have been erring he 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	Forma con V-ing
could I err? could you err? could he err? could we err? could you err? could they err?	could I be erring? could you be erring? could he be erring? could we be erring? could you be erring? could they be erring?
Perfecto	Perfecto con V-ing
could I have erred? could you have erred? could he 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 he have been erring? could we have been erring? could you have been erring? could they have been erring?

Forma interro-negativa

Forma simple	Forma con V-ing
couldn't I err? couldn't you err? couldn't he err? couldn't we err? couldn't you err? couldn't they err?	couldn't I be erring? couldn't you be erring? couldn't he be erring? couldn't we be erring? couldn't you be erring? couldn't they be erring?
Perfecto	Perfecto con V-ing
couldn't I have erred? couldn't you have erred? couldn't he have erred? couldn't we have erred? couldn't you have erred? couldn't they have erred?	couldn't I have been erring? couldn't you have been erring? couldn't he have been erring? couldn't we have been erring? couldn't you have been erring? couldn't they have been erring?