could unthread
Verbo regular: unthread - unthreaded- unthreaded

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could unthread
you could unthread
she could unthread
we could unthread
you could unthread
they could unthread 	I could be unthreading
you could be unthreading
she could be unthreading
we could be unthreading
you could be unthreading
they could be unthreading	I could have unthreaded
you could have unthreaded
she 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
she could have been unthreading
we could have been unthreading
you could have been unthreading
they could have been unthreading	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't unthread
you couldn't unthread
she couldn't unthread
we couldn't unthread
you couldn't unthread
they couldn't unthread 	I couldn't be unthreading
you couldn't be unthreading
she couldn't be unthreading
we couldn't be unthreading
you couldn't be unthreading
they couldn't be unthreading	I couldn't have unthreaded
you couldn't have unthreaded
she couldn't have unthreaded
we couldn't have unthreaded
you couldn't have unthreaded
they couldn't have unthreaded	I couldn't have been unthreading
you couldn't have been unthreading
she couldn't have been unthreading
we couldn't have been unthreading
you couldn't have been unthreading
they couldn't have been unthreading	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I unthread?
could you unthread?
could she unthread?
could we unthread?
could you unthread?
could they unthread? 	could I be unthreading?
could you be unthreading?
could she be unthreading?
could we be unthreading?
could you be unthreading?
could they be unthreading? 	could I have unthreaded?
could you have unthreaded?
could she 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 she have been unthreading?
could we have been unthreading?
could you have been unthreading?
could they have been unthreading? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I unthread?
couldn't you unthread?
couldn't she unthread?
couldn't we unthread?
couldn't you unthread?
couldn't they unthread? 	couldn't I be unthreading?
couldn't you be unthreading?
couldn't she be unthreading?
couldn't we be unthreading?
couldn't you be unthreading?
couldn't they be unthreading? 	couldn't I have unthreaded?
couldn't you have unthreaded?
couldn't she have unthreaded?
couldn't we have unthreaded?
couldn't you have unthreaded?
couldn't they have unthreaded? 	couldn't I have been unthreading?
couldn't you have been unthreading?
couldn't she have been unthreading?
couldn't we have been unthreading?
couldn't you have been unthreading?
couldn't they have been unthreading?