must unbox
Verbo regular: unbox - unboxed- unboxed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must unbox
you must unbox
he must unbox
we must unbox
you must unbox
they must unbox 	I must be unboxing
you must be unboxing
he must be unboxing
we must be unboxing
you must be unboxing
they must be unboxing	I must have unboxed
you must have unboxed
he must have unboxed
we must have unboxed
you must have unboxed
they must have unboxed	I must have been unboxing
you must have been unboxing
he must have been unboxing
we must have been unboxing
you must have been unboxing
they must have been unboxing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not unbox
you must not unbox
he must not unbox
we must not unbox
you must not unbox
they must not unbox 	I must not be unboxing
you must not be unboxing
he must not be unboxing
we must not be unboxing
you must not be unboxing
they must not be unboxing	I must not have unboxed
you must not have unboxed
he must not have unboxed
we must not have unboxed
you must not have unboxed
they must not have unboxed	I must not have been unboxing
you must not have been unboxing
he must not have been unboxing
we must not have been unboxing
you must not have been unboxing
they must not have been unboxing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I unbox?
must you unbox?
must he unbox?
must we unbox?
must you unbox?
must they unbox? 	must I be unboxing?
must you be unboxing?
must he be unboxing?
must we be unboxing?
must you be unboxing?
must they be unboxing? 	must I have unboxed?
must you have unboxed?
must he have unboxed?
must we have unboxed?
must you have unboxed?
must they have unboxed? 	must I have been unboxing?
must you have been unboxing?
must he have been unboxing?
must we have been unboxing?
must you have been unboxing?
must they have been unboxing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not unbox?
must you not unbox?
must he not unbox?
must we not unbox?
must you not unbox?
must they not unbox? 	must I not be unboxing?
must you not be unboxing?
must he not be unboxing?
must we not be unboxing?
must you not be unboxing?
must they not be unboxing? 	must I not have unboxed?
must you not have unboxed?
must he not have unboxed?
must we not have unboxed?
must you not have unboxed?
must they not have unboxed? 	must I not have been unboxing?
must you not have been unboxing?
must he not have been unboxing?
must we not have been unboxing?
must you not have been unboxing?
must they not have been unboxing?