Cuidado, este verbo pode não existir, a conjugação é dada como exemplo.
Afirmação
Forma simple
I could go down you could go down she could go down we could go down you could go down they could go down
Forma com V-ing
I could be go downing you could be go downing she could be go downing we could be go downing you could be go downing they could be go downing
Perfeito
I could have go downed you could have go downed she could have go downed we could have go downed you could have go downed they could have go downed
Perfeito com V-ing
I could have been go downing you could have been go downing she could have been go downing we could have been go downing you could have been go downing they could have been go downing
Negação
Forma simple
I could not go down you could not go down she could not go down we could not go down you could not go down they could not go down
Forma com V-ing
I could not be go downing you could not be go downing she could not be go downing we could not be go downing you could not be go downing they could not be go downing
Perfeito
I could not have go downed you could not have go downed she could not have go downed we could not have go downed you could not have go downed they could not have go downed
Perfeito com V-ing
I could not have been go downing you could not have been go downing she could not have been go downing we could not have been go downing you could not have been go downing they could not have been go downing
Forma interrogativa
Forma simple
could I go down? could you go down? could she go down? could we go down? could you go down? could they go down?
Forma com V-ing
could I be go downing? could you be go downing? could she be go downing? could we be go downing? could you be go downing? could they be go downing?
Perfeito
could I have go downed? could you have go downed? could she have go downed? could we have go downed? could you have go downed? could they have go downed?
Perfeito com V-ing
could I have been go downing? could you have been go downing? could she have been go downing? could we have been go downing? could you have been go downing? could they have been go downing?
Forma interro-Negação
Forma simple
could I not go down? could you not go down? could she not go down? could we not go down? could you not go down? could they not go down?
Forma com V-ing
could I not be go downing? could you not be go downing? could she not be go downing? could we not be go downing? could you not be go downing? could they not be go downing?
Perfeito
could I not have go downed? could you not have go downed? could she not have go downed? could we not have go downed? could you not have go downed? could they not have go downed?
Perfeito com V-ing
could I not have been go downing? could you not have been go downing? could she not have been go downing? could we not have been go downing? could you not have been go downing? could they not have been go downing?