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