English verb conjugation
COULD PI

Regular verb: pi - pied - pied

Affirmation

Simple form	V-ing form
I could pi you could pi she could pi we could pi you could pi they could pi	I could be piing you could be piing she 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 she 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 she 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 she 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 she 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 she 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 she 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 she pi? could we pi? could you pi? could they pi?	could I be piing? could you be piing? could she 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 she 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 she 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 she 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 she 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 she 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 she not have been piing? could we not have been piing? could you not have been piing? could they not have been piing?