English verb conjugation
COULD DOWN

Regular verb: down - downed - downed

Affirmation

Simple form	V-ing form
I could down you could down she could down we could down you could down they could down	I could be downing you could be downing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she down? could we down? could you down? could they down?	could I be downing? could you be downing? could she 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 she 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 she 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 she 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 she 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 she 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 she have been downing? couldn't we have been downing? couldn't you have been downing? couldn't they have been downing?