English verb conjugation
COULD PEN

Regular verb: pen - penned - penned

Affirmation

Simple form	V-ing form
I could pen you could pen he could pen we could pen you could pen they could pen	I could be penning you could be penning he could be penning we could be penning you could be penning they could be penning
Perfect	V-ing perfect
I could have penned you could have penned he could have penned we could have penned you could have penned they could have penned	I could have been penning you could have been penning he could have been penning we could have been penning you could have been penning they could have been penning

Negation

Simple form	V-ing form
I could not pen you could not pen he could not pen we could not pen you could not pen they could not pen	I could not be penning you could not be penning he could not be penning we could not be penning you could not be penning they could not be penning
Perfect	V-ing perfect
I could not have penned you could not have penned he could not have penned we could not have penned you could not have penned they could not have penned	I could not have been penning you could not have been penning he could not have been penning we could not have been penning you could not have been penning they could not have been penning

Interrogative form

Simple form	V-ing form
could I pen? could you pen? could he pen? could we pen? could you pen? could they pen?	could I be penning? could you be penning? could he be penning? could we be penning? could you be penning? could they be penning?
Perfect	V-ing perfect
could I have penned? could you have penned? could he have penned? could we have penned? could you have penned? could they have penned?	could I have been penning? could you have been penning? could he have been penning? could we have been penning? could you have been penning? could they have been penning?

Interro-negative form

Simple form	V-ing form
could I not pen? could you not pen? could he not pen? could we not pen? could you not pen? could they not pen?	could I not be penning? could you not be penning? could he not be penning? could we not be penning? could you not be penning? could they not be penning?
Perfect	V-ing perfect
could I not have penned? could you not have penned? could he not have penned? could we not have penned? could you not have penned? could they not have penned?	could I not have been penning? could you not have been penning? could he not have been penning? could we not have been penning? could you not have been penning? could they not have been penning?