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 couldn't down you couldn't down he couldn't down we couldn't down you couldn't down they couldn't down	I couldn't be downing you couldn't be downing he couldn't be downing we couldn't be downing you couldn't be downing they couldn't be downing
Perfect	V-ing perfect
I couldn't have downed you couldn't have downed he couldn't have downed we couldn't have downed you couldn't have downed they couldn't have downed	I couldn't have been downing you couldn't have been downing he couldn't have been downing we couldn't have been downing you couldn't have been downing they couldn't 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
couldn't I down? couldn't you down? couldn't he down? couldn't we down? couldn't you down? couldn't they down?	couldn't I be downing? couldn't you be downing? couldn't he be downing? couldn't we be downing? couldn't you be downing? couldn't they be downing?
Perfect	V-ing perfect
couldn't I have downed? couldn't you have downed? couldn't he have downed? couldn't we have downed? couldn't you have downed? couldn't they have downed?	couldn't I have been downing? couldn't you have been downing? couldn't he have been downing? couldn't we have been downing? couldn't you have been downing? couldn't they have been downing?