English verb conjugation
COULD HORN

Regular verb: horn - horned - horned

Affirmation

Simple form	V-ing form
I could horn you could horn he could horn we could horn you could horn they could horn	I could be horning you could be horning he could be horning we could be horning you could be horning they could be horning
Perfect	V-ing perfect
I could have horned you could have horned he could have horned we could have horned you could have horned they could have horned	I could have been horning you could have been horning he could have been horning we could have been horning you could have been horning they could have been horning

Negation

Simple form	V-ing form
I could not horn you could not horn he could not horn we could not horn you could not horn they could not horn	I could not be horning you could not be horning he could not be horning we could not be horning you could not be horning they could not be horning
Perfect	V-ing perfect
I could not have horned you could not have horned he could not have horned we could not have horned you could not have horned they could not have horned	I could not have been horning you could not have been horning he could not have been horning we could not have been horning you could not have been horning they could not have been horning

Interrogative form

Simple form	V-ing form
could I horn? could you horn? could he horn? could we horn? could you horn? could they horn?	could I be horning? could you be horning? could he be horning? could we be horning? could you be horning? could they be horning?
Perfect	V-ing perfect
could I have horned? could you have horned? could he have horned? could we have horned? could you have horned? could they have horned?	could I have been horning? could you have been horning? could he have been horning? could we have been horning? could you have been horning? could they have been horning?

Interro-negative form

Simple form	V-ing form
could I not horn? could you not horn? could he not horn? could we not horn? could you not horn? could they not horn?	could I not be horning? could you not be horning? could he not be horning? could we not be horning? could you not be horning? could they not be horning?
Perfect	V-ing perfect
could I not have horned? could you not have horned? could he not have horned? could we not have horned? could you not have horned? could they not have horned?	could I not have been horning? could you not have been horning? could he not have been horning? could we not have been horning? could you not have been horning? could they not have been horning?