must yap yap
Verbe régulier : yap yap - yap yaped- yap yaped

, ce verbe peut ne pas exister, la conjugaison est donnée à titre d'exemple.

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must yap yap
you must yap yap
he must yap yap
we must yap yap
you must yap yap
they must yap yap 	I must be yap yaping
you must be yap yaping
he must be yap yaping
we must be yap yaping
you must be yap yaping
they must be yap yaping	I must have yap yaped
you must have yap yaped
he must have yap yaped
we must have yap yaped
you must have yap yaped
they must have yap yaped	I must have been yap yaping
you must have been yap yaping
he must have been yap yaping
we must have been yap yaping
you must have been yap yaping
they must have been yap yaping	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't yap yap
you mustn't yap yap
he mustn't yap yap
we mustn't yap yap
you mustn't yap yap
they mustn't yap yap 	I mustn't be yap yaping
you mustn't be yap yaping
he mustn't be yap yaping
we mustn't be yap yaping
you mustn't be yap yaping
they mustn't be yap yaping	I mustn't have yap yaped
you mustn't have yap yaped
he mustn't have yap yaped
we mustn't have yap yaped
you mustn't have yap yaped
they mustn't have yap yaped	I mustn't have been yap yaping
you mustn't have been yap yaping
he mustn't have been yap yaping
we mustn't have been yap yaping
you mustn't have been yap yaping
they mustn't have been yap yaping	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I yap yap?
must you yap yap?
must he yap yap?
must we yap yap?
must you yap yap?
must they yap yap? 	must I be yap yaping?
must you be yap yaping?
must he be yap yaping?
must we be yap yaping?
must you be yap yaping?
must they be yap yaping? 	must I have yap yaped?
must you have yap yaped?
must he have yap yaped?
must we have yap yaped?
must you have yap yaped?
must they have yap yaped? 	must I have been yap yaping?
must you have been yap yaping?
must he have been yap yaping?
must we have been yap yaping?
must you have been yap yaping?
must they have been yap yaping? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I yap yap?
mustn't you yap yap?
mustn't he yap yap?
mustn't we yap yap?
mustn't you yap yap?
mustn't they yap yap? 	mustn't I be yap yaping?
mustn't you be yap yaping?
mustn't he be yap yaping?
mustn't we be yap yaping?
mustn't you be yap yaping?
mustn't they be yap yaping? 	mustn't I have yap yaped?
mustn't you have yap yaped?
mustn't he have yap yaped?
mustn't we have yap yaped?
mustn't you have yap yaped?
mustn't they have yap yaped? 	mustn't I have been yap yaping?
mustn't you have been yap yaping?
mustn't he have been yap yaping?
mustn't we have been yap yaping?
mustn't you have been yap yaping?
mustn't they have been yap yaping?