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