can rib
Regular verb: rib - ribed- ribed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can rib
you can rib
she can rib
we can rib
you can rib
they can rib 	I can be ribing
you can be ribing
she can be ribing
we can be ribing
you can be ribing
they can be ribing	I can have ribed
you can have ribed
she 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
she 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 	Perfect 	V-ing perfect 	
I can't rib
you can't rib
she 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
she can't be ribing
we can't be ribing
you can't be ribing
they can't be ribing	I can't have ribed
you can't have ribed
she 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
she 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 	Perfect 	V-ing perfect 	
can I rib?
can you rib?
can she rib?
can we rib?
can you rib?
can they rib? 	can I be ribing?
can you be ribing?
can she be ribing?
can we be ribing?
can you be ribing?
can they be ribing? 	can I have ribed?
can you have ribed?
can she 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 she 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 	Perfect 	V-ing perfect 	
can't I rib?
can't you rib?
can't she 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 she be ribing?
can't we be ribing?
can't you be ribing?
can't they be ribing? 	can't I have ribed?
can't you have ribed?
can't she 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 she have been ribing?
can't we have been ribing?
can't you have been ribing?
can't they have been ribing?