English verb conjugation
CAN PI

Regular verb: pi - pied - pied

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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