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
she could rib
we could rib
you could rib
they could rib 	I could be ribing
you could be ribing
she could be ribing
we could be ribing
you could be ribing
they could be ribing	I could have ribed
you could have ribed
she 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
she 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 could not rib
you could not rib
she could not rib
we could not rib
you could not rib
they could not rib 	I could not be ribing
you could not be ribing
she could not be ribing
we could not be ribing
you could not be ribing
they could not be ribing	I could not have ribed
you could not have ribed
she could not have ribed
we could not have ribed
you could not have ribed
they could not have ribed	I could not have been ribing
you could not have been ribing
she could not have been ribing
we could not have been ribing
you could not have been ribing
they could not have been ribing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I rib?
could you rib?
could she rib?
could we rib?
could you rib?
could they rib? 	could I be ribing?
could you be ribing?
could she be ribing?
could we be ribing?
could you be ribing?
could they be ribing? 	could I have ribed?
could you have ribed?
could she 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 she 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 	
could I not rib?
could you not rib?
could she not rib?
could we not rib?
could you not rib?
could they not rib? 	could I not be ribing?
could you not be ribing?
could she not be ribing?
could we not be ribing?
could you not be ribing?
could they not be ribing? 	could I not have ribed?
could you not have ribed?
could she not have ribed?
could we not have ribed?
could you not have ribed?
could they not have ribed? 	could I not have been ribing?
could you not have been ribing?
could she not have been ribing?
could we not have been ribing?
could you not have been ribing?
could they not have been ribing?