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 couldn't pi you couldn't pi she couldn't pi we couldn't pi you couldn't pi they couldn't pi	I couldn't be piing you couldn't be piing she couldn't be piing we couldn't be piing you couldn't be piing they couldn't be piing
Perfect	V-ing perfect
I couldn't have pied you couldn't have pied she couldn't have pied we couldn't have pied you couldn't have pied they couldn't have pied	I couldn't have been piing you couldn't have been piing she couldn't have been piing we couldn't have been piing you couldn't have been piing they couldn't 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
couldn't I pi? couldn't you pi? couldn't she pi? couldn't we pi? couldn't you pi? couldn't they pi?	couldn't I be piing? couldn't you be piing? couldn't she be piing? couldn't we be piing? couldn't you be piing? couldn't they be piing?
Perfect	V-ing perfect
couldn't I have pied? couldn't you have pied? couldn't she have pied? couldn't we have pied? couldn't you have pied? couldn't they have pied?	couldn't I have been piing? couldn't you have been piing? couldn't she have been piing? couldn't we have been piing? couldn't you have been piing? couldn't they have been piing?