I must unstick you must unstick he must unstick we must unstick you must unstick they must unstick
V-ing form
I must be unsticking you must be unsticking he must be unsticking we must be unsticking you must be unsticking they must be unsticking
Perfect
I must have unsticked you must have unsticked he must have unsticked we must have unsticked you must have unsticked they must have unsticked
V-ing perfect
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
I must not unstick you must not unstick he must not unstick we must not unstick you must not unstick they must not unstick
V-ing form
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
Perfect
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
V-ing perfect
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
must I unstick? must you unstick? must he unstick? must we unstick? must you unstick? must they unstick?
V-ing form
must I be unsticking? must you be unsticking? must he be unsticking? must we be unsticking? must you be unsticking? must they be unsticking?
Perfect
must I have unsticked? must you have unsticked? must he have unsticked? must we have unsticked? must you have unsticked? must they have unsticked?
V-ing perfect
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
must I not unstick? must you not unstick? must he not unstick? must we not unstick? must you not unstick? must they not unstick?
V-ing form
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?
Perfect
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?
V-ing perfect
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?