must skunk
Regular verb: skunk - skunked- skunked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must skunk
you must skunk
he must skunk
we must skunk
you must skunk
they must skunk 	I must be skunking
you must be skunking
he must be skunking
we must be skunking
you must be skunking
they must be skunking	I must have skunked
you must have skunked
he must have skunked
we must have skunked
you must have skunked
they must have skunked	I must have been skunking
you must have been skunking
he must have been skunking
we must have been skunking
you must have been skunking
they must have been skunking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't skunk
you mustn't skunk
he mustn't skunk
we mustn't skunk
you mustn't skunk
they mustn't skunk 	I mustn't be skunking
you mustn't be skunking
he mustn't be skunking
we mustn't be skunking
you mustn't be skunking
they mustn't be skunking	I mustn't have skunked
you mustn't have skunked
he mustn't have skunked
we mustn't have skunked
you mustn't have skunked
they mustn't have skunked	I mustn't have been skunking
you mustn't have been skunking
he mustn't have been skunking
we mustn't have been skunking
you mustn't have been skunking
they mustn't have been skunking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I skunk?
must you skunk?
must he skunk?
must we skunk?
must you skunk?
must they skunk? 	must I be skunking?
must you be skunking?
must he be skunking?
must we be skunking?
must you be skunking?
must they be skunking? 	must I have skunked?
must you have skunked?
must he have skunked?
must we have skunked?
must you have skunked?
must they have skunked? 	must I have been skunking?
must you have been skunking?
must he have been skunking?
must we have been skunking?
must you have been skunking?
must they have been skunking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I skunk?
mustn't you skunk?
mustn't he skunk?
mustn't we skunk?
mustn't you skunk?
mustn't they skunk? 	mustn't I be skunking?
mustn't you be skunking?
mustn't he be skunking?
mustn't we be skunking?
mustn't you be skunking?
mustn't they be skunking? 	mustn't I have skunked?
mustn't you have skunked?
mustn't he have skunked?
mustn't we have skunked?
mustn't you have skunked?
mustn't they have skunked? 	mustn't I have been skunking?
mustn't you have been skunking?
mustn't he have been skunking?
mustn't we have been skunking?
mustn't you have been skunking?
mustn't they have been skunking?