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 must not yuk
you must not yuk
he must not yuk
we must not yuk
you must not yuk
they must not yuk 	I must not be yuking
you must not be yuking
he must not be yuking
we must not be yuking
you must not be yuking
they must not be yuking	I must not have yuked
you must not have yuked
he must not have yuked
we must not have yuked
you must not have yuked
they must not have yuked	I must not have been yuking
you must not have been yuking
he must not have been yuking
we must not have been yuking
you must not have been yuking
they must not 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 	
must I not yuk?
must you not yuk?
must he not yuk?
must we not yuk?
must you not yuk?
must they not yuk? 	must I not be yuking?
must you not be yuking?
must he not be yuking?
must we not be yuking?
must you not be yuking?
must they not be yuking? 	must I not have yuked?
must you not have yuked?
must he not have yuked?
must we not have yuked?
must you not have yuked?
must they not have yuked? 	must I not have been yuking?
must you not have been yuking?
must he not have been yuking?
must we not have been yuking?
must you not have been yuking?
must they not have been yuking?