English verb conjugation
MUST UNBOX

Regular verb: unbox - unboxed - unboxed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?