English verb conjugation
COULD PI

Regular verb: pi - pied - pied

Affirmation

Simple form	V-ing form
I could pi you could pi he could pi we could pi you could pi they could pi	I could be piing you could be piing he could be piing we could be piing you could be piing they could be piing
Perfect	V-ing perfect
I could have pied you could have pied he could have pied we could have pied you could have pied they could have pied	I could have been piing you could have been piing he could have been piing we could have been piing you could have been piing they could have been piing

Negation

Simple form	V-ing form
I could not pi you could not pi he could not pi we could not pi you could not pi they could not pi	I could not be piing you could not be piing he could not be piing we could not be piing you could not be piing they could not be piing
Perfect	V-ing perfect
I could not have pied you could not have pied he could not have pied we could not have pied you could not have pied they could not have pied	I could not have been piing you could not have been piing he could not have been piing we could not have been piing you could not have been piing they could not have been piing

Interrogative form

Simple form	V-ing form
could I pi? could you pi? could he pi? could we pi? could you pi? could they pi?	could I be piing? could you be piing? could he be piing? could we be piing? could you be piing? could they be piing?
Perfect	V-ing perfect
could I have pied? could you have pied? could he have pied? could we have pied? could you have pied? could they have pied?	could I have been piing? could you have been piing? could he have been piing? could we have been piing? could you have been piing? could they have been piing?

Interro-negative form

Simple form	V-ing form
could I not pi? could you not pi? could he not pi? could we not pi? could you not pi? could they not pi?	could I not be piing? could you not be piing? could he not be piing? could we not be piing? could you not be piing? could they not be piing?
Perfect	V-ing perfect
could I not have pied? could you not have pied? could he not have pied? could we not have pied? could you not have pied? could they not have pied?	could I not have been piing? could you not have been piing? could he not have been piing? could we not have been piing? could you not have been piing? could they not have been piing?