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 couldn't pi you couldn't pi he 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 he 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 he 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 he 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 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
couldn't I pi? couldn't you pi? couldn't he 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 he 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 he 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 he have been piing? couldn't we have been piing? couldn't you have been piing? couldn't they have been piing?