must yuk
Regular verb: yuk - yuked- yuked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must yuk
you must yuk
he must yuk
we must yuk
you must yuk
they must yuk 	I must be yuking
you must be yuking
he must be yuking
we must be yuking
you must be yuking
they must be yuking	I must have yuked
you must have yuked
he must have yuked
we must have yuked
you must have yuked
they must have yuked	I must have been yuking
you must have been yuking
he must have been yuking
we must have been yuking
you must have been yuking
they must have been yuking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't yuk
you mustn't yuk
he mustn't yuk
we mustn't yuk
you mustn't yuk
they mustn't yuk 	I mustn't be yuking
you mustn't be yuking
he mustn't be yuking
we mustn't be yuking
you mustn't be yuking
they mustn't be yuking	I mustn't have yuked
you mustn't have yuked
he mustn't have yuked
we mustn't have yuked
you mustn't have yuked
they mustn't have yuked	I mustn't have been yuking
you mustn't have been yuking
he mustn't have been yuking
we mustn't have been yuking
you mustn't have been yuking
they mustn't have been yuking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I yuk?
must you yuk?
must he yuk?
must we yuk?
must you yuk?
must they yuk? 	must I be yuking?
must you be yuking?
must he be yuking?
must we be yuking?
must you be yuking?
must they be yuking? 	must I have yuked?
must you have yuked?
must he have yuked?
must we have yuked?
must you have yuked?
must they have yuked? 	must I have been yuking?
must you have been yuking?
must he have been yuking?
must we have been yuking?
must you have been yuking?
must they have been yuking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I yuk?
mustn't you yuk?
mustn't he yuk?
mustn't we yuk?
mustn't you yuk?
mustn't they yuk? 	mustn't I be yuking?
mustn't you be yuking?
mustn't he be yuking?
mustn't we be yuking?
mustn't you be yuking?
mustn't they be yuking? 	mustn't I have yuked?
mustn't you have yuked?
mustn't he have yuked?
mustn't we have yuked?
mustn't you have yuked?
mustn't they have yuked? 	mustn't I have been yuking?
mustn't you have been yuking?
mustn't he have been yuking?
mustn't we have been yuking?
mustn't you have been yuking?
mustn't they have been yuking?