must unstring
Verbo irregular: unstring - unstrung- unstrung

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must unstring
you must unstring
he must unstring
we must unstring
you must unstring
they must unstring 	I must be unstringing
you must be unstringing
he must be unstringing
we must be unstringing
you must be unstringing
they must be unstringing	I must have unstrung
you must have unstrung
he must have unstrung
we must have unstrung
you must have unstrung
they must have unstrung	I must have been unstringing
you must have been unstringing
he must have been unstringing
we must have been unstringing
you must have been unstringing
they must have been unstringing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't unstring
you mustn't unstring
he mustn't unstring
we mustn't unstring
you mustn't unstring
they mustn't unstring 	I mustn't be unstringing
you mustn't be unstringing
he mustn't be unstringing
we mustn't be unstringing
you mustn't be unstringing
they mustn't be unstringing	I mustn't have unstrung
you mustn't have unstrung
he mustn't have unstrung
we mustn't have unstrung
you mustn't have unstrung
they mustn't have unstrung	I mustn't have been unstringing
you mustn't have been unstringing
he mustn't have been unstringing
we mustn't have been unstringing
you mustn't have been unstringing
they mustn't have been unstringing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I unstring?
must you unstring?
must he unstring?
must we unstring?
must you unstring?
must they unstring? 	must I be unstringing?
must you be unstringing?
must he be unstringing?
must we be unstringing?
must you be unstringing?
must they be unstringing? 	must I have unstrung?
must you have unstrung?
must he have unstrung?
must we have unstrung?
must you have unstrung?
must they have unstrung? 	must I have been unstringing?
must you have been unstringing?
must he have been unstringing?
must we have been unstringing?
must you have been unstringing?
must they have been unstringing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I unstring?
mustn't you unstring?
mustn't he unstring?
mustn't we unstring?
mustn't you unstring?
mustn't they unstring? 	mustn't I be unstringing?
mustn't you be unstringing?
mustn't he be unstringing?
mustn't we be unstringing?
mustn't you be unstringing?
mustn't they be unstringing? 	mustn't I have unstrung?
mustn't you have unstrung?
mustn't he have unstrung?
mustn't we have unstrung?
mustn't you have unstrung?
mustn't they have unstrung? 	mustn't I have been unstringing?
mustn't you have been unstringing?
mustn't he have been unstringing?
mustn't we have been unstringing?
mustn't you have been unstringing?
mustn't they have been unstringing?