must unstop
Regular verb: unstop - unstopped- unstopped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must unstop
you must unstop
he must unstop
we must unstop
you must unstop
they must unstop 	I must be unstopping
you must be unstopping
he must be unstopping
we must be unstopping
you must be unstopping
they must be unstopping	I must have unstopped
you must have unstopped
he must have unstopped
we must have unstopped
you must have unstopped
they must have unstopped	I must have been unstopping
you must have been unstopping
he must have been unstopping
we must have been unstopping
you must have been unstopping
they must have been unstopping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't unstop
you mustn't unstop
he mustn't unstop
we mustn't unstop
you mustn't unstop
they mustn't unstop 	I mustn't be unstopping
you mustn't be unstopping
he mustn't be unstopping
we mustn't be unstopping
you mustn't be unstopping
they mustn't be unstopping	I mustn't have unstopped
you mustn't have unstopped
he mustn't have unstopped
we mustn't have unstopped
you mustn't have unstopped
they mustn't have unstopped	I mustn't have been unstopping
you mustn't have been unstopping
he mustn't have been unstopping
we mustn't have been unstopping
you mustn't have been unstopping
they mustn't have been unstopping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I unstop?
must you unstop?
must he unstop?
must we unstop?
must you unstop?
must they unstop? 	must I be unstopping?
must you be unstopping?
must he be unstopping?
must we be unstopping?
must you be unstopping?
must they be unstopping? 	must I have unstopped?
must you have unstopped?
must he have unstopped?
must we have unstopped?
must you have unstopped?
must they have unstopped? 	must I have been unstopping?
must you have been unstopping?
must he have been unstopping?
must we have been unstopping?
must you have been unstopping?
must they have been unstopping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I unstop?
mustn't you unstop?
mustn't he unstop?
mustn't we unstop?
mustn't you unstop?
mustn't they unstop? 	mustn't I be unstopping?
mustn't you be unstopping?
mustn't he be unstopping?
mustn't we be unstopping?
mustn't you be unstopping?
mustn't they be unstopping? 	mustn't I have unstopped?
mustn't you have unstopped?
mustn't he have unstopped?
mustn't we have unstopped?
mustn't you have unstopped?
mustn't they have unstopped? 	mustn't I have been unstopping?
mustn't you have been unstopping?
mustn't he have been unstopping?
mustn't we have been unstopping?
mustn't you have been unstopping?
mustn't they have been unstopping?