must yuck
Verbe régulier : yuck - yucked- yucked

Affirmation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I must yuck
you must yuck
he must yuck
we must yuck
you must yuck
they must yuck 	I must be yucking
you must be yucking
he must be yucking
we must be yucking
you must be yucking
they must be yucking	I must have yucked
you must have yucked
he must have yucked
we must have yucked
you must have yucked
they must have yucked	I must have been yucking
you must have been yucking
he must have been yucking
we must have been yucking
you must have been yucking
they must have been yucking	

Négation 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
I mustn't yuck
you mustn't yuck
he mustn't yuck
we mustn't yuck
you mustn't yuck
they mustn't yuck 	I mustn't be yucking
you mustn't be yucking
he mustn't be yucking
we mustn't be yucking
you mustn't be yucking
they mustn't be yucking	I mustn't have yucked
you mustn't have yucked
he mustn't have yucked
we mustn't have yucked
you mustn't have yucked
they mustn't have yucked	I mustn't have been yucking
you mustn't have been yucking
he mustn't have been yucking
we mustn't have been yucking
you mustn't have been yucking
they mustn't have been yucking	

Forme interrogative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
must I yuck?
must you yuck?
must he yuck?
must we yuck?
must you yuck?
must they yuck? 	must I be yucking?
must you be yucking?
must he be yucking?
must we be yucking?
must you be yucking?
must they be yucking? 	must I have yucked?
must you have yucked?
must he have yucked?
must we have yucked?
must you have yucked?
must they have yucked? 	must I have been yucking?
must you have been yucking?
must he have been yucking?
must we have been yucking?
must you have been yucking?
must they have been yucking? 	

Forme interro-négative 	
Forme simple 	Forme en V-ing 	Perfect 	Perfect en V-ing 	
mustn't I yuck?
mustn't you yuck?
mustn't he yuck?
mustn't we yuck?
mustn't you yuck?
mustn't they yuck? 	mustn't I be yucking?
mustn't you be yucking?
mustn't he be yucking?
mustn't we be yucking?
mustn't you be yucking?
mustn't they be yucking? 	mustn't I have yucked?
mustn't you have yucked?
mustn't he have yucked?
mustn't we have yucked?
mustn't you have yucked?
mustn't they have yucked? 	mustn't I have been yucking?
mustn't you have been yucking?
mustn't he have been yucking?
mustn't we have been yucking?
mustn't you have been yucking?
mustn't they have been yucking?