could unstring
Irregular verb: unstring - unstrung- unstrung

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could unstring
you could unstring
she could unstring
we could unstring
you could unstring
they could unstring 	I could be unstringing
you could be unstringing
she could be unstringing
we could be unstringing
you could be unstringing
they could be unstringing	I could have unstrung
you could have unstrung
she could have unstrung
we could have unstrung
you could have unstrung
they could have unstrung	I could have been unstringing
you could have been unstringing
she could have been unstringing
we could have been unstringing
you could have been unstringing
they could have been unstringing	

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

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I unstring?
could you unstring?
could she unstring?
could we unstring?
could you unstring?
could they unstring? 	could I be unstringing?
could you be unstringing?
could she be unstringing?
could we be unstringing?
could you be unstringing?
could they be unstringing? 	could I have unstrung?
could you have unstrung?
could she have unstrung?
could we have unstrung?
could you have unstrung?
could they have unstrung? 	could I have been unstringing?
could you have been unstringing?
could she have been unstringing?
could we have been unstringing?
could you have been unstringing?
could they have been unstringing? 	

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