Warning, this verb may not exist. Conjugation is given as example.
Affirmation
Simple form
I can go down you can go down he can go down we can go down you can go down they can go down
V-ing form
I can be go downing you can be go downing he can be go downing we can be go downing you can be go downing they can be go downing
Perfect
I can have go downed you can have go downed he can have go downed we can have go downed you can have go downed they can have go downed
V-ing perfect
I can have been go downing you can have been go downing he can have been go downing we can have been go downing you can have been go downing they can have been go downing
Negation
Simple form
I can't go down you can't go down he can't go down we can't go down you can't go down they can't go down
V-ing form
I can't be go downing you can't be go downing he can't be go downing we can't be go downing you can't be go downing they can't be go downing
Perfect
I can't have go downed you can't have go downed he can't have go downed we can't have go downed you can't have go downed they can't have go downed
V-ing perfect
I can't have been go downing you can't have been go downing he can't have been go downing we can't have been go downing you can't have been go downing they can't have been go downing
Interrogative form
Simple form
can I go down? can you go down? can he go down? can we go down? can you go down? can they go down?
V-ing form
can I be go downing? can you be go downing? can he be go downing? can we be go downing? can you be go downing? can they be go downing?
Perfect
can I have go downed? can you have go downed? can he have go downed? can we have go downed? can you have go downed? can they have go downed?
V-ing perfect
can I have been go downing? can you have been go downing? can he have been go downing? can we have been go downing? can you have been go downing? can they have been go downing?
Interro-negative form
Simple form
can't I go down? can't you go down? can't he go down? can't we go down? can't you go down? can't they go down?
V-ing form
can't I be go downing? can't you be go downing? can't he be go downing? can't we be go downing? can't you be go downing? can't they be go downing?
Perfect
can't I have go downed? can't you have go downed? can't he have go downed? can't we have go downed? can't you have go downed? can't they have go downed?
V-ing perfect
can't I have been go downing? can't you have been go downing? can't he have been go downing? can't we have been go downing? can't you have been go downing? can't they have been go downing?