must yackety-yak
Verbe régulier : yackety-yak - yackety-yaked- yackety-yaked
Traduction française : jacasser 

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must yackety-yak
you must yackety-yak
he must yackety-yak
we must yackety-yak
you must yackety-yak
they must yackety-yak 	I must be yackety-yaking
you must be yackety-yaking
he must be yackety-yaking
we must be yackety-yaking
you must be yackety-yaking
they must be yackety-yaking	I must have yackety-yaked
you must have yackety-yaked
he must have yackety-yaked
we must have yackety-yaked
you must have yackety-yaked
they must have yackety-yaked	I must have been yackety-yaking
you must have been yackety-yaking
he must have been yackety-yaking
we must have been yackety-yaking
you must have been yackety-yaking
they must have been yackety-yaking	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't yackety-yak
you mustn't yackety-yak
he mustn't yackety-yak
we mustn't yackety-yak
you mustn't yackety-yak
they mustn't yackety-yak 	I mustn't be yackety-yaking
you mustn't be yackety-yaking
he mustn't be yackety-yaking
we mustn't be yackety-yaking
you mustn't be yackety-yaking
they mustn't be yackety-yaking	I mustn't have yackety-yaked
you mustn't have yackety-yaked
he mustn't have yackety-yaked
we mustn't have yackety-yaked
you mustn't have yackety-yaked
they mustn't have yackety-yaked	I mustn't have been yackety-yaking
you mustn't have been yackety-yaking
he mustn't have been yackety-yaking
we mustn't have been yackety-yaking
you mustn't have been yackety-yaking
they mustn't have been yackety-yaking	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I yackety-yak?
must you yackety-yak?
must he yackety-yak?
must we yackety-yak?
must you yackety-yak?
must they yackety-yak? 	must I be yackety-yaking?
must you be yackety-yaking?
must he be yackety-yaking?
must we be yackety-yaking?
must you be yackety-yaking?
must they be yackety-yaking? 	must I have yackety-yaked?
must you have yackety-yaked?
must he have yackety-yaked?
must we have yackety-yaked?
must you have yackety-yaked?
must they have yackety-yaked? 	must I have been yackety-yaking?
must you have been yackety-yaking?
must he have been yackety-yaking?
must we have been yackety-yaking?
must you have been yackety-yaking?
must they have been yackety-yaking? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I yackety-yak?
mustn't you yackety-yak?
mustn't he yackety-yak?
mustn't we yackety-yak?
mustn't you yackety-yak?
mustn't they yackety-yak? 	mustn't I be yackety-yaking?
mustn't you be yackety-yaking?
mustn't he be yackety-yaking?
mustn't we be yackety-yaking?
mustn't you be yackety-yaking?
mustn't they be yackety-yaking? 	mustn't I have yackety-yaked?
mustn't you have yackety-yaked?
mustn't he have yackety-yaked?
mustn't we have yackety-yaked?
mustn't you have yackety-yaked?
mustn't they have yackety-yaked? 	mustn't I have been yackety-yaking?
mustn't you have been yackety-yaking?
mustn't he have been yackety-yaking?
mustn't we have been yackety-yaking?
mustn't you have been yackety-yaking?
mustn't they have been yackety-yaking?