must unstick
Regular verb: unstick - unsticked- unsticked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must unstick
you must unstick
he must unstick
we must unstick
you must unstick
they must unstick 	I must be unsticking
you must be unsticking
he must be unsticking
we must be unsticking
you must be unsticking
they must be unsticking	I must have unsticked
you must have unsticked
he must have unsticked
we must have unsticked
you must have unsticked
they must have unsticked	I must have been unsticking
you must have been unsticking
he must have been unsticking
we must have been unsticking
you must have been unsticking
they must have been unsticking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't unstick
you mustn't unstick
he mustn't unstick
we mustn't unstick
you mustn't unstick
they mustn't unstick 	I mustn't be unsticking
you mustn't be unsticking
he mustn't be unsticking
we mustn't be unsticking
you mustn't be unsticking
they mustn't be unsticking	I mustn't have unsticked
you mustn't have unsticked
he mustn't have unsticked
we mustn't have unsticked
you mustn't have unsticked
they mustn't have unsticked	I mustn't have been unsticking
you mustn't have been unsticking
he mustn't have been unsticking
we mustn't have been unsticking
you mustn't have been unsticking
they mustn't have been unsticking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I unstick?
must you unstick?
must he unstick?
must we unstick?
must you unstick?
must they unstick? 	must I be unsticking?
must you be unsticking?
must he be unsticking?
must we be unsticking?
must you be unsticking?
must they be unsticking? 	must I have unsticked?
must you have unsticked?
must he have unsticked?
must we have unsticked?
must you have unsticked?
must they have unsticked? 	must I have been unsticking?
must you have been unsticking?
must he have been unsticking?
must we have been unsticking?
must you have been unsticking?
must they have been unsticking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I unstick?
mustn't you unstick?
mustn't he unstick?
mustn't we unstick?
mustn't you unstick?
mustn't they unstick? 	mustn't I be unsticking?
mustn't you be unsticking?
mustn't he be unsticking?
mustn't we be unsticking?
mustn't you be unsticking?
mustn't they be unsticking? 	mustn't I have unsticked?
mustn't you have unsticked?
mustn't he have unsticked?
mustn't we have unsticked?
mustn't you have unsticked?
mustn't they have unsticked? 	mustn't I have been unsticking?
mustn't you have been unsticking?
mustn't he have been unsticking?
mustn't we have been unsticking?
mustn't you have been unsticking?
mustn't they have been unsticking?