could unthread
Verbo regular: unthread - unthreaded- unthreaded

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could unthread
you could unthread
he could unthread
we could unthread
you could unthread
they could unthread 	I could be unthreading
you could be unthreading
he could be unthreading
we could be unthreading
you could be unthreading
they could be unthreading	I could have unthreaded
you could have unthreaded
he could have unthreaded
we could have unthreaded
you could have unthreaded
they could have unthreaded	I could have been unthreading
you could have been unthreading
he could have been unthreading
we could have been unthreading
you could have been unthreading
they could have been unthreading	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not unthread
you could not unthread
he could not unthread
we could not unthread
you could not unthread
they could not unthread 	I could not be unthreading
you could not be unthreading
he could not be unthreading
we could not be unthreading
you could not be unthreading
they could not be unthreading	I could not have unthreaded
you could not have unthreaded
he could not have unthreaded
we could not have unthreaded
you could not have unthreaded
they could not have unthreaded	I could not have been unthreading
you could not have been unthreading
he could not have been unthreading
we could not have been unthreading
you could not have been unthreading
they could not have been unthreading	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I unthread?
could you unthread?
could he unthread?
could we unthread?
could you unthread?
could they unthread? 	could I be unthreading?
could you be unthreading?
could he be unthreading?
could we be unthreading?
could you be unthreading?
could they be unthreading? 	could I have unthreaded?
could you have unthreaded?
could he have unthreaded?
could we have unthreaded?
could you have unthreaded?
could they have unthreaded? 	could I have been unthreading?
could you have been unthreading?
could he have been unthreading?
could we have been unthreading?
could you have been unthreading?
could they have been unthreading? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not unthread?
could you not unthread?
could he not unthread?
could we not unthread?
could you not unthread?
could they not unthread? 	could I not be unthreading?
could you not be unthreading?
could he not be unthreading?
could we not be unthreading?
could you not be unthreading?
could they not be unthreading? 	could I not have unthreaded?
could you not have unthreaded?
could he not have unthreaded?
could we not have unthreaded?
could you not have unthreaded?
could they not have unthreaded? 	could I not have been unthreading?
could you not have been unthreading?
could he not have been unthreading?
could we not have been unthreading?
could you not have been unthreading?
could they not have been unthreading?