could rib
Verbo regular: rib - ribed- ribed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could rib
you could rib
he could rib
we could rib
you could rib
they could rib 	I could be ribing
you could be ribing
he could be ribing
we could be ribing
you could be ribing
they could be ribing	I could have ribed
you could have ribed
he could have ribed
we could have ribed
you could have ribed
they could have ribed	I could have been ribing
you could have been ribing
he could have been ribing
we could have been ribing
you could have been ribing
they could have been ribing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't rib
you couldn't rib
he couldn't rib
we couldn't rib
you couldn't rib
they couldn't rib 	I couldn't be ribing
you couldn't be ribing
he couldn't be ribing
we couldn't be ribing
you couldn't be ribing
they couldn't be ribing	I couldn't have ribed
you couldn't have ribed
he couldn't have ribed
we couldn't have ribed
you couldn't have ribed
they couldn't have ribed	I couldn't have been ribing
you couldn't have been ribing
he couldn't have been ribing
we couldn't have been ribing
you couldn't have been ribing
they couldn't have been ribing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I rib?
could you rib?
could he rib?
could we rib?
could you rib?
could they rib? 	could I be ribing?
could you be ribing?
could he be ribing?
could we be ribing?
could you be ribing?
could they be ribing? 	could I have ribed?
could you have ribed?
could he have ribed?
could we have ribed?
could you have ribed?
could they have ribed? 	could I have been ribing?
could you have been ribing?
could he have been ribing?
could we have been ribing?
could you have been ribing?
could they have been ribing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I rib?
couldn't you rib?
couldn't he rib?
couldn't we rib?
couldn't you rib?
couldn't they rib? 	couldn't I be ribing?
couldn't you be ribing?
couldn't he be ribing?
couldn't we be ribing?
couldn't you be ribing?
couldn't they be ribing? 	couldn't I have ribed?
couldn't you have ribed?
couldn't he have ribed?
couldn't we have ribed?
couldn't you have ribed?
couldn't they have ribed? 	couldn't I have been ribing?
couldn't you have been ribing?
couldn't he have been ribing?
couldn't we have been ribing?
couldn't you have been ribing?
couldn't they have been ribing?