must unstick
Regular verb: unstick - unsticked- unsticked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must unstick
you must unstick
she must unstick
we must unstick
you must unstick
they must unstick 	I must be unsticking
you must be unsticking
she must be unsticking
we must be unsticking
you must be unsticking
they must be unsticking	I must have unsticked
you must have unsticked
she 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
she 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
she 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
she 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
she 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
she 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 she unstick?
must we unstick?
must you unstick?
must they unstick? 	must I be unsticking?
must you be unsticking?
must she be unsticking?
must we be unsticking?
must you be unsticking?
must they be unsticking? 	must I have unsticked?
must you have unsticked?
must she 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 she 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 she 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 she 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 she 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 she have been unsticking?
mustn't we have been unsticking?
mustn't you have been unsticking?
mustn't they have been unsticking?