could yo-yo
Verbo regular: yo-yo - yo-yoed- yo-yoed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could yo-yo
you could yo-yo
he could yo-yo
we could yo-yo
you could yo-yo
they could yo-yo 	I could be yo-yoing
you could be yo-yoing
he could be yo-yoing
we could be yo-yoing
you could be yo-yoing
they could be yo-yoing	I could have yo-yoed
you could have yo-yoed
he could have yo-yoed
we could have yo-yoed
you could have yo-yoed
they could have yo-yoed	I could have been yo-yoing
you could have been yo-yoing
he could have been yo-yoing
we could have been yo-yoing
you could have been yo-yoing
they could have been yo-yoing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not yo-yo
you could not yo-yo
he could not yo-yo
we could not yo-yo
you could not yo-yo
they could not yo-yo 	I could not be yo-yoing
you could not be yo-yoing
he could not be yo-yoing
we could not be yo-yoing
you could not be yo-yoing
they could not be yo-yoing	I could not have yo-yoed
you could not have yo-yoed
he could not have yo-yoed
we could not have yo-yoed
you could not have yo-yoed
they could not have yo-yoed	I could not have been yo-yoing
you could not have been yo-yoing
he could not have been yo-yoing
we could not have been yo-yoing
you could not have been yo-yoing
they could not have been yo-yoing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I yo-yo?
could you yo-yo?
could he yo-yo?
could we yo-yo?
could you yo-yo?
could they yo-yo? 	could I be yo-yoing?
could you be yo-yoing?
could he be yo-yoing?
could we be yo-yoing?
could you be yo-yoing?
could they be yo-yoing? 	could I have yo-yoed?
could you have yo-yoed?
could he have yo-yoed?
could we have yo-yoed?
could you have yo-yoed?
could they have yo-yoed? 	could I have been yo-yoing?
could you have been yo-yoing?
could he have been yo-yoing?
could we have been yo-yoing?
could you have been yo-yoing?
could they have been yo-yoing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not yo-yo?
could you not yo-yo?
could he not yo-yo?
could we not yo-yo?
could you not yo-yo?
could they not yo-yo? 	could I not be yo-yoing?
could you not be yo-yoing?
could he not be yo-yoing?
could we not be yo-yoing?
could you not be yo-yoing?
could they not be yo-yoing? 	could I not have yo-yoed?
could you not have yo-yoed?
could he not have yo-yoed?
could we not have yo-yoed?
could you not have yo-yoed?
could they not have yo-yoed? 	could I not have been yo-yoing?
could you not have been yo-yoing?
could he not have been yo-yoing?
could we not have been yo-yoing?
could you not have been yo-yoing?
could they not have been yo-yoing?