must unbar
Regular verb: unbar - unbarred- unbarred

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must unbar
you must unbar
he must unbar
we must unbar
you must unbar
they must unbar 	I must be unbarring
you must be unbarring
he must be unbarring
we must be unbarring
you must be unbarring
they must be unbarring	I must have unbarred
you must have unbarred
he must have unbarred
we must have unbarred
you must have unbarred
they must have unbarred	I must have been unbarring
you must have been unbarring
he must have been unbarring
we must have been unbarring
you must have been unbarring
they must have been unbarring	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't unbar
you mustn't unbar
he mustn't unbar
we mustn't unbar
you mustn't unbar
they mustn't unbar 	I mustn't be unbarring
you mustn't be unbarring
he mustn't be unbarring
we mustn't be unbarring
you mustn't be unbarring
they mustn't be unbarring	I mustn't have unbarred
you mustn't have unbarred
he mustn't have unbarred
we mustn't have unbarred
you mustn't have unbarred
they mustn't have unbarred	I mustn't have been unbarring
you mustn't have been unbarring
he mustn't have been unbarring
we mustn't have been unbarring
you mustn't have been unbarring
they mustn't have been unbarring	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I unbar?
must you unbar?
must he unbar?
must we unbar?
must you unbar?
must they unbar? 	must I be unbarring?
must you be unbarring?
must he be unbarring?
must we be unbarring?
must you be unbarring?
must they be unbarring? 	must I have unbarred?
must you have unbarred?
must he have unbarred?
must we have unbarred?
must you have unbarred?
must they have unbarred? 	must I have been unbarring?
must you have been unbarring?
must he have been unbarring?
must we have been unbarring?
must you have been unbarring?
must they have been unbarring? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I unbar?
mustn't you unbar?
mustn't he unbar?
mustn't we unbar?
mustn't you unbar?
mustn't they unbar? 	mustn't I be unbarring?
mustn't you be unbarring?
mustn't he be unbarring?
mustn't we be unbarring?
mustn't you be unbarring?
mustn't they be unbarring? 	mustn't I have unbarred?
mustn't you have unbarred?
mustn't he have unbarred?
mustn't we have unbarred?
mustn't you have unbarred?
mustn't they have unbarred? 	mustn't I have been unbarring?
mustn't you have been unbarring?
mustn't he have been unbarring?
mustn't we have been unbarring?
mustn't you have been unbarring?
mustn't they have been unbarring?