could unstring
Verbo irregular: unstring - unstrung- unstrung

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't unstring
you couldn't unstring
she couldn't unstring
we couldn't unstring
you couldn't unstring
they couldn't unstring 	I couldn't be unstringing
you couldn't be unstringing
she couldn't be unstringing
we couldn't be unstringing
you couldn't be unstringing
they couldn't be unstringing	I couldn't have unstrung
you couldn't have unstrung
she couldn't have unstrung
we couldn't have unstrung
you couldn't have unstrung
they couldn't have unstrung	I couldn't have been unstringing
you couldn't have been unstringing
she couldn't have been unstringing
we couldn't have been unstringing
you couldn't have been unstringing
they couldn't have been unstringing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
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? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I unstring?
couldn't you unstring?
couldn't she unstring?
couldn't we unstring?
couldn't you unstring?
couldn't they unstring? 	couldn't I be unstringing?
couldn't you be unstringing?
couldn't she be unstringing?
couldn't we be unstringing?
couldn't you be unstringing?
couldn't they be unstringing? 	couldn't I have unstrung?
couldn't you have unstrung?
couldn't she have unstrung?
couldn't we have unstrung?
couldn't you have unstrung?
couldn't they have unstrung? 	couldn't I have been unstringing?
couldn't you have been unstringing?
couldn't she have been unstringing?
couldn't we have been unstringing?
couldn't you have been unstringing?
couldn't they have been unstringing?