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