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 must not unstick
you must not unstick
he must not unstick
we must not unstick
you must not unstick
they must not unstick 	I must not be unsticking
you must not be unsticking
he must not be unsticking
we must not be unsticking
you must not be unsticking
they must not be unsticking	I must not have unsticked
you must not have unsticked
he must not have unsticked
we must not have unsticked
you must not have unsticked
they must not have unsticked	I must not have been unsticking
you must not have been unsticking
he must not have been unsticking
we must not have been unsticking
you must not have been unsticking
they must not 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 	
must I not unstick?
must you not unstick?
must he not unstick?
must we not unstick?
must you not unstick?
must they not unstick? 	must I not be unsticking?
must you not be unsticking?
must he not be unsticking?
must we not be unsticking?
must you not be unsticking?
must they not be unsticking? 	must I not have unsticked?
must you not have unsticked?
must he not have unsticked?
must we not have unsticked?
must you not have unsticked?
must they not have unsticked? 	must I not have been unsticking?
must you not have been unsticking?
must he not have been unsticking?
must we not have been unsticking?
must you not have been unsticking?
must they not have been unsticking?