must unthread
Verbo regular: unthread - unthreaded- unthreaded

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

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I must not unthread
you must not unthread
he must not unthread
we must not unthread
you must not unthread
they must not unthread 	I must not be unthreading
you must not be unthreading
he must not be unthreading
we must not be unthreading
you must not be unthreading
they must not be unthreading	I must not have unthreaded
you must not have unthreaded
he must not have unthreaded
we must not have unthreaded
you must not have unthreaded
they must not have unthreaded	I must not have been unthreading
you must not have been unthreading
he must not have been unthreading
we must not have been unthreading
you must not have been unthreading
they must not have been unthreading	

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

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
must I not unthread?
must you not unthread?
must he not unthread?
must we not unthread?
must you not unthread?
must they not unthread? 	must I not be unthreading?
must you not be unthreading?
must he not be unthreading?
must we not be unthreading?
must you not be unthreading?
must they not be unthreading? 	must I not have unthreaded?
must you not have unthreaded?
must he not have unthreaded?
must we not have unthreaded?
must you not have unthreaded?
must they not have unthreaded? 	must I not have been unthreading?
must you not have been unthreading?
must he not have been unthreading?
must we not have been unthreading?
must you not have been unthreading?
must they not have been unthreading?