English verb conjugation
CAN RIB

Regular verb: rib - ribed - ribed

Affirmation

Simple form	V-ing form
I can rib you can rib he can rib we can rib you can rib they can rib	I can be ribing you can be ribing he can be ribing we can be ribing you can be ribing they can be ribing
Perfect	V-ing perfect
I can have ribed you can have ribed he can have ribed we can have ribed you can have ribed they can have ribed	I can have been ribing you can have been ribing he can have been ribing we can have been ribing you can have been ribing they can have been ribing

Negation

Simple form	V-ing form
I cannot rib you cannot rib he cannot rib we cannot rib you cannot rib they cannot rib	I cannot be ribing you cannot be ribing he cannot be ribing we cannot be ribing you cannot be ribing they cannot be ribing
Perfect	V-ing perfect
I cannot have ribed you cannot have ribed he cannot have ribed we cannot have ribed you cannot have ribed they cannot have ribed	I cannot have been ribing you cannot have been ribing he cannot have been ribing we cannot have been ribing you cannot have been ribing they cannot have been ribing

Interrogative form

Simple form	V-ing form
can I rib? can you rib? can he rib? can we rib? can you rib? can they rib?	can I be ribing? can you be ribing? can he be ribing? can we be ribing? can you be ribing? can they be ribing?
Perfect	V-ing perfect
can I have ribed? can you have ribed? can he have ribed? can we have ribed? can you have ribed? can they have ribed?	can I have been ribing? can you have been ribing? can he have been ribing? can we have been ribing? can you have been ribing? can they have been ribing?

Interro-negative form

Simple form	V-ing form
can I not rib? can you not rib? can he not rib? can we not rib? can you not rib? can they not rib?	can I not be ribing? can you not be ribing? can he not be ribing? can we not be ribing? can you not be ribing? can they not be ribing?
Perfect	V-ing perfect
can I not have ribed? can you not have ribed? can he not have ribed? can we not have ribed? can you not have ribed? can they not have ribed?	can I not have been ribing? can you not have been ribing? can he not have been ribing? can we not have been ribing? can you not have been ribing? can they not have been ribing?