English verb conjugation
COULD DOWN

Regular verb: down - downed - downed

Affirmation

Simple form	V-ing form
I could down you could down he could down we could down you could down they could down	I could be downing you could be downing he could be downing we could be downing you could be downing they could be downing
Perfect	V-ing perfect
I could have downed you could have downed he could have downed we could have downed you could have downed they could have downed	I could have been downing you could have been downing he could have been downing we could have been downing you could have been downing they could have been downing

Negation

Simple form	V-ing form
I could not down you could not down he could not down we could not down you could not down they could not down	I could not be downing you could not be downing he could not be downing we could not be downing you could not be downing they could not be downing
Perfect	V-ing perfect
I could not have downed you could not have downed he could not have downed we could not have downed you could not have downed they could not have downed	I could not have been downing you could not have been downing he could not have been downing we could not have been downing you could not have been downing they could not have been downing

Interrogative form

Simple form	V-ing form
could I down? could you down? could he down? could we down? could you down? could they down?	could I be downing? could you be downing? could he be downing? could we be downing? could you be downing? could they be downing?
Perfect	V-ing perfect
could I have downed? could you have downed? could he have downed? could we have downed? could you have downed? could they have downed?	could I have been downing? could you have been downing? could he have been downing? could we have been downing? could you have been downing? could they have been downing?

Interro-negative form

Simple form	V-ing form
could I not down? could you not down? could he not down? could we not down? could you not down? could they not down?	could I not be downing? could you not be downing? could he not be downing? could we not be downing? could you not be downing? could they not be downing?
Perfect	V-ing perfect
could I not have downed? could you not have downed? could he not have downed? could we not have downed? could you not have downed? could they not have downed?	could I not have been downing? could you not have been downing? could he not have been downing? could we not have been downing? could you not have been downing? could they not have been downing?