English verb conjugation
CAN DOWN

Regular verb: down - downed - downed

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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