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 can't rib you can't rib he can't rib we can't rib you can't rib they can't rib	I can't be ribing you can't be ribing he can't be ribing we can't be ribing you can't be ribing they can't be ribing
Perfect	V-ing perfect
I can't have ribed you can't have ribed he can't have ribed we can't have ribed you can't have ribed they can't have ribed	I can't have been ribing you can't have been ribing he can't have been ribing we can't have been ribing you can't have been ribing they can't 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't I rib? can't you rib? can't he rib? can't we rib? can't you rib? can't they rib?	can't I be ribing? can't you be ribing? can't he be ribing? can't we be ribing? can't you be ribing? can't they be ribing?
Perfect	V-ing perfect
can't I have ribed? can't you have ribed? can't he have ribed? can't we have ribed? can't you have ribed? can't they have ribed?	can't I have been ribing? can't you have been ribing? can't he have been ribing? can't we have been ribing? can't you have been ribing? can't they have been ribing?