must unstring
Irregular verb: unstring - unstrung- unstrung

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not unstring
you must not unstring
he must not unstring
we must not unstring
you must not unstring
they must not unstring 	I must not be unstringing
you must not be unstringing
he must not be unstringing
we must not be unstringing
you must not be unstringing
they must not be unstringing	I must not have unstrung
you must not have unstrung
he must not have unstrung
we must not have unstrung
you must not have unstrung
they must not have unstrung	I must not have been unstringing
you must not have been unstringing
he must not have been unstringing
we must not have been unstringing
you must not have been unstringing
they must not have been unstringing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not unstring?
must you not unstring?
must he not unstring?
must we not unstring?
must you not unstring?
must they not unstring? 	must I not be unstringing?
must you not be unstringing?
must he not be unstringing?
must we not be unstringing?
must you not be unstringing?
must they not be unstringing? 	must I not have unstrung?
must you not have unstrung?
must he not have unstrung?
must we not have unstrung?
must you not have unstrung?
must they not have unstrung? 	must I not have been unstringing?
must you not have been unstringing?
must he not have been unstringing?
must we not have been unstringing?
must you not have been unstringing?
must they not have been unstringing?