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 couldn't go down you couldn't go down she couldn't go down we couldn't go down you couldn't go down they couldn't go down
Forma com V-ing
I couldn't be go downing you couldn't be go downing she couldn't be go downing we couldn't be go downing you couldn't be go downing they couldn't be go downing
Perfeito
I couldn't have go downed you couldn't have go downed she couldn't have go downed we couldn't have go downed you couldn't have go downed they couldn't have go downed
Perfeito com V-ing
I couldn't have been go downing you couldn't have been go downing she couldn't have been go downing we couldn't have been go downing you couldn't have been go downing they couldn't 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
couldn't I go down? couldn't you go down? couldn't she go down? couldn't we go down? couldn't you go down? couldn't they go down?
Forma com V-ing
couldn't I be go downing? couldn't you be go downing? couldn't she be go downing? couldn't we be go downing? couldn't you be go downing? couldn't they be go downing?
Perfeito
couldn't I have go downed? couldn't you have go downed? couldn't she have go downed? couldn't we have go downed? couldn't you have go downed? couldn't they have go downed?
Perfeito com V-ing
couldn't I have been go downing? couldn't you have been go downing? couldn't she have been go downing? couldn't we have been go downing? couldn't you have been go downing? couldn't they have been go downing?