must yo-yo
Verbe régulier : yo-yo - yo-yoed- yo-yoed

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must yo-yo
you must yo-yo
he must yo-yo
we must yo-yo
you must yo-yo
they must yo-yo 	I must be yo-yoing
you must be yo-yoing
he must be yo-yoing
we must be yo-yoing
you must be yo-yoing
they must be yo-yoing	I must have yo-yoed
you must have yo-yoed
he must have yo-yoed
we must have yo-yoed
you must have yo-yoed
they must have yo-yoed	I must have been yo-yoing
you must have been yo-yoing
he must have been yo-yoing
we must have been yo-yoing
you must have been yo-yoing
they must have been yo-yoing	

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

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I yo-yo?
must you yo-yo?
must he yo-yo?
must we yo-yo?
must you yo-yo?
must they yo-yo? 	must I be yo-yoing?
must you be yo-yoing?
must he be yo-yoing?
must we be yo-yoing?
must you be yo-yoing?
must they be yo-yoing? 	must I have yo-yoed?
must you have yo-yoed?
must he have yo-yoed?
must we have yo-yoed?
must you have yo-yoed?
must they have yo-yoed? 	must I have been yo-yoing?
must you have been yo-yoing?
must he have been yo-yoing?
must we have been yo-yoing?
must you have been yo-yoing?
must they have been yo-yoing? 	

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