could yo-yo
Verbe régulier : yo-yo - yo-yoed- yo-yoed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I could yo-yo
you could yo-yo
she 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
she 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
she 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
she could have been yo-yoing
we could have been yo-yoing
you could have been yo-yoing
they could have been yo-yoing	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I couldn't yo-yo
you couldn't yo-yo
she couldn't yo-yo
we couldn't yo-yo
you couldn't yo-yo
they couldn't yo-yo 	I couldn't be yo-yoing
you couldn't be yo-yoing
she couldn't be yo-yoing
we couldn't be yo-yoing
you couldn't be yo-yoing
they couldn't be yo-yoing	I couldn't have yo-yoed
you couldn't have yo-yoed
she couldn't have yo-yoed
we couldn't have yo-yoed
you couldn't have yo-yoed
they couldn't have yo-yoed	I couldn't have been yo-yoing
you couldn't have been yo-yoing
she couldn't have been yo-yoing
we couldn't have been yo-yoing
you couldn't have been yo-yoing
they couldn't have been yo-yoing	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
could I yo-yo?
could you yo-yo?
could she 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 she 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 she 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 she have been yo-yoing?
could we have been yo-yoing?
could you have been yo-yoing?
could they have been yo-yoing? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
couldn't I yo-yo?
couldn't you yo-yo?
couldn't she yo-yo?
couldn't we yo-yo?
couldn't you yo-yo?
couldn't they yo-yo? 	couldn't I be yo-yoing?
couldn't you be yo-yoing?
couldn't she be yo-yoing?
couldn't we be yo-yoing?
couldn't you be yo-yoing?
couldn't they be yo-yoing? 	couldn't I have yo-yoed?
couldn't you have yo-yoed?
couldn't she have yo-yoed?
couldn't we have yo-yoed?
couldn't you have yo-yoed?
couldn't they have yo-yoed? 	couldn't I have been yo-yoing?
couldn't you have been yo-yoing?
couldn't she have been yo-yoing?
couldn't we have been yo-yoing?
couldn't you have been yo-yoing?
couldn't they have been yo-yoing?