English verb conjugation
CAN PIE

Regular verb: pie - pied - pied

Affirmation

Simple form	V-ing form
I can pie you can pie he can pie we can pie you can pie they can pie	I can be pying you can be pying he can be pying we can be pying you can be pying they can be pying
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 pying you can have been pying he can have been pying we can have been pying you can have been pying they can have been pying

Negation

Simple form	V-ing form
I cannot pie you cannot pie he cannot pie we cannot pie you cannot pie they cannot pie	I cannot be pying you cannot be pying he cannot be pying we cannot be pying you cannot be pying they cannot be pying
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 pying you cannot have been pying he cannot have been pying we cannot have been pying you cannot have been pying they cannot have been pying

Interrogative form

Simple form	V-ing form
can I pie? can you pie? can he pie? can we pie? can you pie? can they pie?	can I be pying? can you be pying? can he be pying? can we be pying? can you be pying? can they be pying?
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 pying? can you have been pying? can he have been pying? can we have been pying? can you have been pying? can they have been pying?

Interro-negative form

Simple form	V-ing form
can I not pie? can you not pie? can he not pie? can we not pie? can you not pie? can they not pie?	can I not be pying? can you not be pying? can he not be pying? can we not be pying? can you not be pying? can they not be pying?
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 pying? can you not have been pying? can he not have been pying? can we not have been pying? can you not have been pying? can they not have been pying?